A weak acid has a pKa of 5.35. What is the hydronium ion concentration in a 0.10 M solution of this weak acid?
1. 5.4 x 10-4 M
2. 6.3 x 10-6 M
3. 3.5 x 10-5 M
4. 2.3 x 10-6 M
5. 4.5 x 10-6 M
6. 6.7 x 10-4 M
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