What is the conjugate acid of CO_3^-2? CO_2^-2 HCO_3^- H_2CO_3 HCO_2^-2 none of

Question

What is the conjugate acid of CO_3^-2? CO_2^-2 HCO_3^- H_2CO_3 HCO_2^-2 none of the above What is the pOH of an aqueous solution at 25.0 degree C that contains 3.98 times 10^-9 M hydronium ion? 8.4000 9.000 5.600 3.980 7.000 What is the pH of an aqueous solution at 25.0 degree C that contains 3.98 times 10^-9 M hydroxide ion? 8.40 3.98 9.00 5.60 7.00 The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 degree C is 2.03. What is the value of K_a for HF? 3.5 times 10^-4 1.1 times 10^-9 6.0 times 10^-5 2.0 times 10^-9 none of the above The third law of thermodynamics states: The entropy of the universe is increasing. The entropy is zero at 0 K for a perfect crystal. The entropy of the universe is constant. The absolute entropy of a substance decreases with increasing temperature. The entropy of the universe equals the sum of the entropy of system and surroundings.

Explanation / Answer

24.

speciess which are differ in one H difference are known as conjugate acid base pair

CO3-2 is base conjugate acid for this is HCO3-1

so option B is correct answer

25.

use the formula ionic product of water

[H3O+] [HO-] = 1.0 x 10^-14

he has already given hydronium ion concentration

[H3O+] = 3.98 x 10^-9

plug in above equation

[3.98 x 10^-9] [HO-] = 1.0 x 10^-14

[HO-] = 1.0 x 10^-14 / [3.98 x 10^-9]

[HO-] = 2.5 x 10^-6 M

pOH = -log[HO-] = -log[2.5 x 10^-6]

pOH = 5.6

option C is correct answer.

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