First slide

PH of strong acids and strong bases

Question

The number of H₃O⁺ ions present in 10 ml of water at 25⁰C is

Easy

A

6.023 x 10^-14
B

6.023 x 10¹⁴
C

6.03 x 10^-19
D

6.023 x 10¹⁹

Solution

[H⁺]=10^-7 of water at 25^oC n_H⁺present in 10 ml of water $= 10^{- 7} \times 10 \times 10^{- 3}$
n_H⁺present in 10 ml of water =10^-9mole
Number of H⁺/H₃O⁺ present in 10 ml of water at 25^oC = 10^-9 x 6.023 x10²³
Number of H⁺/H₃O⁺ present in 10 ml of water at 25^oC = 6.023 x10¹⁴

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