2) Consider the following four weak acids: CH COOH K HBrO 1.8 x 10 Ka 2.5 x 10-.

Question

2) Consider the following four weak acids: CH COOH K HBrO 1.8 x 10 Ka 2.5 x 10-.9 HCIO2 C6HSOH K 1.1 x 102 K-1.3x1010 Which of the following weak acid/conjugate base pairs would be best suited to make a pH 9.50 buffer? a) CH3COOH and CH;COONa b) HBrO and NaBrO c) HCIO2 and NaCIO2 d) C6HsOH and CsHsONa e) All of the above are equally suited to make a pH = 9.50 buffer 3) Which of the following reactions will go essentially to completion? a) NaOH(aq) + HBr(aq) strong base + strong acid b) NH3(aq) + HBr(aq) weak base strong acid c) NH3(aq) + HCIO(aq) weak base+weak acid d) Both a and b e) Both a and b and c

Explanation / Answer

for a solution of PH = 905 buffer, PKa of weak acid sholud be near 9.5

so in above solution PKaof C6H5Oh = - log (1.3 * 10-8) = 9.88 which is nearest to 9.5

so this weak acid will give buffer of desired PH = 905

so answer is d = C6H5OH and C6H5ONa

only strong acid and strong base reaction will go on completion because weak acid or weak base doesn't dissociates completely.

so answer is a = NaOH + HBr ( Strong Acid and Strong Base)

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