A hydrochloric acid solution is made by dissolving 3.75 g of HCL(g) in 4.2 L of water. Determine the pH of this solution.
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concentration= number of moles ÷ volume
number of moles= given mass÷ molecular mass of HCl
= 3.75/36.5
=0.102 moles
[H+] concentration=0.102/4.2= 0.0244
pH= - log [ H+]
= - log 0.0244
= - log 24× 10^-3
= - log 24 - log 10^-3
= - 1.38 + 3
=1.62
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