How do you calculate the pH of a 5.0 x 10^-3M solution of H2SO4?

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How do you calculate the pH of a 5.0 x 10^-3M solution of H2SO4?

I thought I did it right, but when I used the quadratic equation, I ended up with two negative answers. Help!!!

2007-10-24 20:04:15 · 1 answers · asked by wsxuyhb;iyfoutf 4 in Education & Reference ➔ Homework Help

1 answers

H2SO4 is a strong acid, completely ionized in (dilute) solution. Therefore, you do not need the quadratic equation. You need to know the no of moles of H, and take -log of that. Since there are 2 H atoms in each mole of H2SO4, the molarity of H is 2x that of H2SO4, or 10^-2 M, pH = 2

2007-10-24 20:44:43 · answer #1 · answered by gp4rts 7 · 0⤊ 1⤋