Which has highest pH? - DASH

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Question

Which has highest pH?

CH₃COOK

Na₂CO₃

NH₄Cl

NaNO₃

Solution

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Step-by-Step Explanation Step 1: Identify the nature of each salt CH3COOK: Formed from a weak acid (CH3COOH) and a strong base (KOH). Its solution is mildly basic. Na2CO3: Formed from a weak acid (H2CO3) and a strong base (NaOH). Its solution is basic. NH4Cl: Formed from a weak base (NH3) and a strong acid (HCl). Its solution is slightly acidic. NaNO3: Formed from a strong base (NaOH) and a strong acid (HNO3). Its solution is neutral. Step 2: Determine the basicity or acidity of each solution Salts of a weak acid and strong base (e.g., CH3COOK, Na2CO3) generally make the solution basic. Salts of a strong acid and weak base (e.g., NH4Cl) generally make the solution acidic. Salts of a strong acid and strong base (e.g., NaNO3) generally make the solution neutral. Step 3: Compare the degree of basicity Among the salts of weak acids and strong bases, Na2CO3 tends to hydrolyze more strongly, producing more OH− ions in solution. This is because CO32− (carbonate ion) is more prone to accept protons than the acetate ion (CH3COO−), resulting in a higher concentration of OH− in water. Step 4: Conclude which salt has the highest pH Since Na2CO3 forms a strongly basic solution among the given options, its pH will be the highest. Final Answer Na2CO3

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