70 Pre-med/IB-style questions covering Arrhenius vs Brønsted–Lowry vs Lewis definitions, conjugate pairs, amphiprotic species, strong/weak vs concentrated/dilute, pH/pOH and Kw, buffers, titrations, salt hydrolysis, and common conceptual traps.
In Brønsted–Lowry theory, an acid is best defined as:
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Acids and Bases","questions":[{"prompt":"In Brønsted–Lowry theory, an acid is best defined as:","options":[{"label":"A","body":"A substance that increases [OH−] in water","isCorrect":false},{"label":"B","body":"A proton (H+) donor","isCorrect":true},{"label":"C","body":"An electron-pair donor","isCorrect":false},{"label":"D","body":"A substance with pH > 7","isCorrect":false},{"label":"E","body":"Any molecule containing hydrogen","isCorrect":false}],"explanation":"A Brønsted–Lowry acid donates a proton (H+). Increasing [OH−] describes an Arrhenius base, electron-pair donor describes a Lewis base, pH>7 is not a definition, and having hydrogen is not sufficient to be an acid."},{"prompt":"In Brønsted–Lowry theory, a base is best defined as:","options":[{"label":"A","body":"A proton (H+) acceptor","isCorrect":true},{"label":"B","body":"A proton (H+) donor","isCorrect":false},{"label":"C","body":"A substance that always contains OH− in its formula","isCorrect":false},{"label":"D","body":"A substance with pH < 7","isCorrect":false},{"label":"E","body":"A substance that releases electrons into solution","isCorrect":false}],"explanation":"A Brønsted–Lowry base accepts a proton. Bases do not need to contain OH− (e.g., NH3), and pH < 7 describes acids, not bases."},{"prompt":"Which statement matches the Arrhenius definition of an acid?","options":[{"label":"A","body":"A substance that donates an electron pair","isCorrect":false},{"label":"B","body":"A substance that accepts a proton","isCorrect":false},{"label":"C","body":"A substance that increases the concentration of H3O+ in aqueous solution","isCorrect":true},{"label":"D","body":"A substance that always reacts with metals to produce hydrogen gas","isCorrect":false},{"label":"E","body":"A substance that is always molecular","isCorrect":false}],"explanation":"Arrhenius acids increase [H3O+] (or [H+]) in water. Proton-accepting is Brønsted base; electron-pair donation is Lewis base. Not all acids produce H2 with metals, and acids can be ionic or molecular."},{"prompt":"Which statement correctly defines a Lewis acid?","options":[{"label":"A","body":"A proton donor","isCorrect":false},{"label":"B","body":"An electron-pair acceptor","isCorrect":true},{"label":"C","body":"An electron-pair donor","isCorrect":false},{"label":"D","body":"A substance that increases [OH−] in water","isCorrect":false},{"label":"E","body":"A substance with a bitter taste","isCorrect":false}],"explanation":"A Lewis acid accepts an electron pair (e.g., BF3). Proton donor is Brønsted acid; electron-pair donor is Lewis base; [OH−] increase is Arrhenius base; taste is not a scientific definition."},{"prompt":"In the reaction NH3 + H2O ⇌ NH4+ + OH−, which species is the Brønsted–Lowry acid?","options":[{"label":"A","body":"NH3","isCorrect":false},{"label":"B","body":"H2O","isCorrect":true},{"label":"C","body":"NH4+","isCorrect":false},{"label":"D","body":"OH−","isCorrect":false},{"label":"E","body":"All species are acids","isCorrect":false}],"explanation":"The Brønsted acid donates H+. Water donates H+ to NH3 to form NH4+, so H2O acts as the acid here. NH3 is the base (accepts H+)."},{"prompt":"In the reaction NH3 + H2O ⇌ NH4+ + OH−, what is the conjugate acid of NH3?","options":[{"label":"A","body":"H2O","isCorrect":false},{"label":"B","body":"NH2−","isCorrect":false},{"label":"C","body":"NH4+","isCorrect":true},{"label":"D","body":"OH−","isCorrect":false},{"label":"E","body":"H3O+","isCorrect":false}],"explanation":"A conjugate acid is formed when a base gains H+. NH3 gains H+ to become NH4+."},{"prompt":"Which species is amphiprotic (can act as BOTH a Brønsted acid and a Brønsted base)?","options":[{"label":"A","body":"Cl−","isCorrect":false},{"label":"B","body":"NH4+","isCorrect":false},{"label":"C","body":"HCO3−","isCorrect":true},{"label":"D","body":"Na+","isCorrect":false},{"label":"E","body":"CH4","isCorrect":false}],"explanation":"HCO3− can donate H+ to become CO3^2− (acid behavior) or accept H+ to become H2CO3 (base behavior). Cl− and Na+ do not donate/accept H+ in this sense; NH4+ is mainly an acid; CH4 is extremely weak as an acid/base in water."},{"prompt":"Which of the following is commonly classified as a strong acid in water?","options":[{"label":"A","body":"CH3COOH","isCorrect":false},{"label":"B","body":"HF","isCorrect":false},{"label":"C","body":"HCl","isCorrect":true},{"label":"D","body":"H2CO3","isCorrect":false},{"label":"E","body":"NH4+","isCorrect":false}],"explanation":"HCl is a strong acid (essentially complete ionization in water). Acetic acid, HF, and carbonic acid are weak acids; NH4+ is a weak acid (conjugate acid of NH3)."},{"prompt":"Which of the following is commonly classified as a strong base in water (in typical high-school chemistry)?","options":[{"label":"A","body":"NH3","isCorrect":false},{"label":"B","body":"NaOH","isCorrect":true},{"label":"C","body":"CH3COO−","isCorrect":false},{"label":"D","body":"H2O","isCorrect":false},{"label":"E","body":"CO2","isCorrect":false}],"explanation":"NaOH is a strong base (dissociates to give OH−). NH3 is a weak base; acetate is a weak base; water is amphiprotic; CO2 is an acidic oxide in water."},{"prompt":"Which statement correctly distinguishes a strong acid from a concentrated acid?","options":[{"label":"A","body":"A strong acid has a low pH, while a concentrated acid has pH = 0","isCorrect":false},{"label":"B","body":"A strong acid fully ionizes in water, while a concentrated acid simply has a high molar concentration","isCorrect":true},{"label":"C","body":"A strong acid always contains oxygen, while a concentrated acid does not","isCorrect":false},{"label":"D","body":"A strong acid is always dangerous, while a concentrated acid is always safe","isCorrect":false},{"label":"E","body":"Strong acids have higher molar mass than concentrated acids","isCorrect":false}],"explanation":"Strength refers to degree of ionization (how completely it forms ions). Concentration refers to how much acid is dissolved per liter. A weak acid can be concentrated, and a strong acid can be dilute."},{"prompt":"At 25°C, the pH of pure water is closest to:","options":[{"label":"A","body":"0","isCorrect":false},{"label":"B","body":"7","isCorrect":true},{"label":"C","body":"14","isCorrect":false},{"label":"D","body":"1","isCorrect":false},{"label":"E","body":"Depends only on the container size","isCorrect":false}],"explanation":"At 25°C, pure water autoionizes so that [H3O+] = [OH−] = 1.0×10^−7 M, giving pH = 7. (At other temperatures pH of neutral water changes, but 25°C is the standard reference.)"},{"prompt":"A solution has [H3O+] = 1.0 × 10^−3 M. What is its pH (approximately)?","options":[{"label":"A","body":"3","isCorrect":true},{"label":"B","body":"7","isCorrect":false},{"label":"C","body":"11","isCorrect":false},{"label":"D","body":"−3","isCorrect":false},{"label":"E","body":"0.001","isCorrect":false}],"explanation":"pH = −log10[H3O+]. For 1.0×10^−3, pH = 3. The pH is not the concentration itself."},{"prompt":"If pH = 2, the hydronium concentration is closest to:","options":[{"label":"A","body":"1 × 10^−2 M","isCorrect":true},{"label":"B","body":"2 × 10^−2 M","isCorrect":false},{"label":"C","body":"1 × 10^−12 M","isCorrect":false},{"label":"D","body":"2 M","isCorrect":false},{"label":"E","body":"1 × 10^2 M","isCorrect":false}],"explanation":"[H3O+] = 10^−pH, so for pH 2: [H3O+] = 10^−2 M."},{"prompt":"If [OH−] = 1.0 × 10^−4 M at 25°C, what is the pH (approximately)?","options":[{"label":"A","body":"4","isCorrect":false},{"label":"B","body":"7","isCorrect":false},{"label":"C","body":"10","isCorrect":true},{"label":"D","body":"14","isCorrect":false},{"label":"E","body":"18","isCorrect":false}],"explanation":"pOH = −log10[OH−] = 4, and at 25°C pH + pOH = 14, so pH = 10."},{"prompt":"Which statement about pH is correct?","options":[{"label":"A","body":"A pH change of 1 unit means [H3O+] changes by a factor of 2","isCorrect":false},{"label":"B","body":"Lower pH means higher [H3O+]","isCorrect":true},{"label":"C","body":"pH is directly equal to [H3O+]","isCorrect":false},{"label":"D","body":"Neutral solutions always have pH 7 at any temperature","isCorrect":false},{"label":"E","body":"pH can never be below 0","isCorrect":false}],"explanation":"pH is a log scale: lower pH corresponds to higher [H3O+]. A 1-unit pH change corresponds to a 10× change in [H3O+]. Neutral pH depends on temperature, and very concentrated acids can have negative pH."},{"prompt":"At 25°C, if [H3O+] = [OH−], the solution is:","options":[{"label":"A","body":"Always acidic (pH < 7)","isCorrect":false},{"label":"B","body":"Always basic (pH > 7)","isCorrect":false},{"label":"C","body":"Neutral (pH = 7)","isCorrect":true},{"label":"D","body":"Impossible because [H3O+] and [OH−] cannot be equal","isCorrect":false},{"label":"E","body":"Neutral only if the solution contains NaCl","isCorrect":false}],"explanation":"At 25°C, neutrality means [H3O+] = [OH−] = 1.0×10^−7 M, which corresponds to pH 7. Equality indicates neutrality (at that temperature)."},{"prompt":"Which statement about polyprotic acids is correct?","options":[{"label":"A","body":"They can donate more than one proton per molecule","isCorrect":true},{"label":"B","body":"They must be strong acids","isCorrect":false},{"label":"C","body":"They always donate all protons completely in water","isCorrect":false},{"label":"D","body":"They have exactly one conjugate base","isCorrect":false},{"label":"E","body":"They cannot form buffers","isCorrect":false}],"explanation":"Polyprotic acids (e.g., H2CO3, H3PO4) can donate multiple protons stepwise, often with decreasing strength at each step. They have multiple conjugate bases and can form buffer systems."},{"prompt":"For the acid H2CO3, what is the conjugate base after it donates ONE proton?","options":[{"label":"A","body":"CO3^2−","isCorrect":false},{"label":"B","body":"HCO3−","isCorrect":true},{"label":"C","body":"H3CO3+","isCorrect":false},{"label":"D","body":"CO2","isCorrect":false},{"label":"E","body":"OH−","isCorrect":false}],"explanation":"Removing one proton from H2CO3 gives HCO3−. CO3^2− would require losing two protons total."},{"prompt":"Which conjugate acid–base pair differs by exactly one proton (H+)?","options":[{"label":"A","body":"HCl / Cl2","isCorrect":false},{"label":"B","body":"H2O / O2−","isCorrect":false},{"label":"C","body":"NH4+ / NH3","isCorrect":true},{"label":"D","body":"H2CO3 / CO2","isCorrect":false},{"label":"E","body":"NaOH / Na+","isCorrect":false}],"explanation":"Conjugate pairs differ by one H+. NH4+ and NH3 differ by one proton. The other pairs do not differ by exactly one proton."},{"prompt":"Which statement about H2SO4 in water is most accurate at an introductory level?","options":[{"label":"A","body":"Both protons dissociate completely with equal strength","isCorrect":false},{"label":"B","body":"The first dissociation is strong; the second dissociation is weaker (partial)","isCorrect":true},{"label":"C","body":"H2SO4 is a weak acid because it has two protons","isCorrect":false},{"label":"D","body":"H2SO4 cannot donate protons because sulfate is stable","isCorrect":false},{"label":"E","body":"H2SO4 is a base because it contains oxygen","isCorrect":false}],"explanation":"Sulfuric acid is strong for the first proton (essentially complete), while the second dissociation is weaker. Treating both steps as equally complete is a common oversimplification."}]}"
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