A solution of methanoic acid, HCOOH (Ka = 1.8 × 10-4) has pH 2.69. What amount...

Question

Question

A solution of methanoic acid, HCOOH (K_a = 1.8 × 10^-4) has pH 2.69. What amount of methanoic acid is dissolved in 2.00 L of this solution?

A. 0.030 mol

B. 0.050 mol

C. 0.040 mol

D. 0.060 mol

E. 0.020 mol

science chemistry

Answer 1

Answer #1

Ans. B. 0.050 mol

Molarity is defined as number of moles of solute present in per litre solution.

i.e molarity = mol/L

First we calculate the molarity of solution of methanoic acid and from that calculate the number of moles of methanoic acid in 2.00 L of solution.

Answer 2

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