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# 1)A 0.10 M aqueous solution of an acid HX has a pH of 3.00. What is the value of Ka for HX? Is that 1* 10-5 2)Which of the following mixtures will be...

1)A 0.10 M aqueous solution of an acid HX has a pH of 3.00. What is the value of Ka for HX?
Is that 1* 10-5

2)Which of the following mixtures will be a buffer when dissolved in a liter of water?

a. 0.1 mol Ca(OH)2 and 0.3 mol HI

b. 0.3 mol NaCl and 0.3 mol HCl

c. 0.4 mol NH3 and 0.4 mol HCl

d. 0.2 mol HBr and 0.1 mol NaOH

e. 0.2 mol H3PO4 and 0.1 mol NaOH

I am not sure which one, I think (d)
Thanks.

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1) A 0.10 M aqueous solution of an acid HX has a pH of 3.00. What is the value of Ka for HX?
Is that 1* 10-5
HX + H2O(l) = H+ + X[H+] = [ X-]
pH = -log [H]
[H+] = 10^-3
Ka = product/reactant
Ka =...

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