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saveliy_v [14]
3 years ago
9

Formic acid, which is a component of insect venom, has a ka = 1.8 ´ 10-4. what is the [h3o+] in a solution that is initially 0.1

0 m formic acid, hcooh? question 24 options: 1) 4.2 ´ 10-3 m 2) 1.8 ´ 10-5 m 3) 8.4 ´ 10-3 m 4) 1.8 ´ 10-6 m 5) 1.8 ´ 10-4 m
Chemistry
1 answer:
scoray [572]3 years ago
7 0
Answer is: concentratio of H₃O⁺ ions is 4.2·10⁻³ M.<span>
Chemical reaction: HCOOH(aq) + H</span>₂O(l) ⇄ HCOO⁻(aq) + H₃O⁺(aq).<span>
c(HCOOH) = 0,1 M.
[</span>H₃O⁺] = [HCOO⁻] = x.<span>
[HCOOH] = 0,1 M - x.
</span>Ka = [H₃O⁺] · [HCOO⁻] / [HCOOH].
0,00018 = x² / (0,1 M - x).<span>
Solve quadratic equation: x = </span>[H₃O⁺] = 0,0042 M.
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