Question

Please solve quickly : The ph of 10^(-10) M H2SO4 is almost : a) >7 b) <7 c) 6 d) 0

Answer 1

H2SO4(aq) ------> 2H+(aq) + (SO4)^2-(aq)

1 mole of H2SO4 produce 2 moles of H+

0.01 M of H2SO4 produce 0.02 M of H+

pH = -log[H+]

pH = -log(0.02) = 1.70

b) <7

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Answer 2

The pH of the given solution is greater than 7.

Explanation:

pH is defined as negative logarithm of hydrogen ion concentration. It is basically defined as the power of hydrogen ions in a solution.

Mathematically,  

$pH=-\log[H^+]$

1 mole of $H_2SO_4$ produces 2 moles of $H^+$ ions and 1 mole of $SO_4^{2-}$ ions

We are given:

$[H^+]=(2\times 10^{-10})M$

Putting values in above equation, we get:

$pH=-\log(2\times 10^{-10})\\\\pH=9.69$

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