What is the pH of a solution of 50.0 g A- (FM= 134.32 g/mol) mixed with...

What is the pH of a solution of 50.0 g A- (FM= 134.32 g/mol) mixed with 200 mL 1.2 M HCl? (Ka = 5.67 x 10-7)

Expert Solution

moles of A- = 50 / 134.32 = 0.372 mol

moles of HCl = 200 x 1.2 / 1000 = 0.240 mol

Ka = 5.67 x 10^-7

pKa = -log Ka = 6.25

A- + HCl ------------------> HA + Cl-

0.372 0.240 0 0

0.132 0 0.240

pH = pKa + log [salt / acid]

= 6.25 + log [0.132 / 0.240]

pH = 5.99

queen_honey_blossom answered 2 years ago

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