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acid and base help?

A 0.050 M solution of the weak acid HA has [H3O+] = 3.77 × 10-4 M. What is the Ka for the acid?
is answer 2.84*10^-6
plz help me

2007-03-08 23:34:13 · 1 answers · asked by phong pham 2 in Science & Mathematics ➔ Chemistry

1 answers

i think you got the right answer
[h3o+]=[A-]=x
Ka=x*x/.05
ka=(3.77*10^-4)^2/.05=2.84*10 ^ -6

2007-03-09 01:15:49 · answer #1 · answered by Helper 6 · 0⤊ 0⤋

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