The pH of four different solutions was determined and then small amounts of stro

Question

The pH of four different solutions was determined and then small amounts of strong acid (0.01 mol) were added consecutively to equal volumes of each. From these measurements, we can conclude that before any acid was added solutions 1 and 3 are buffers but solution 3 has a greater buffer capacity than 1. solutions 2 and 4 are buffers but solution 2 has a greater buffer capacity than 4. solutions 3 and 4 are buffers but solution 4 has a greater buffer capacity than 3. none of the four initial solutions is a buffer. Equal volumes of solutions of acids and their sodium salts are mixed to prepare a buffer. The solution with pH closest to 5.0 was prepared by mixing 1.0 times 10^-5 M hydrochloric acid and 0.1 M NaCl 0.10 M benzoic acid (K_a = 6.3 times 10^-5) and 0.10 M sodium benzoate 0.10 M butyric acid (K_a = 1.5 times 10^-5) and 0.10 M sodium butyrate 0.10 M formic acid (K_a = 4.3 times 10^-4) and 0.10 M sodium format

Explanation / Answer

Buffer solution- the solution in which on addition small amount of a strong acid and strong base the pH is not altered by any great extend is called buffer solution

In solution 2 and 3 pH is not change on addition strong acid by any great extend so both are buffer solution

- solution 2nd has more buffer capacity because change in pH is small

Answer-(B)

Buffer solution- the solution in which on addition small amount of a strong acid and strong base the pH is not altered by any great extend is called buffer solution

In solution 2 and 3 pH is not change on addition strong acid by any great extend so both are buffer solution

- solution 2nd has more buffer capacity because change in pH is small

Answer-(B)

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