Calculate the pH of a $ 0.1 \; M $ ammonium chloride solution ! Species influencing the pH ?
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$NH_4^+$ is a weak acid, $Cl^-$ has no effect on pH.
What is the initial molarity of $NH_4^+$ ?
$c_{NH_4^+}=0,1\;M$
Equation ?
With $x=[H_3O^+]$: $x^2\;+\;10^{-9.20}\;x\;-\;10^{-9.20}\;0.1\;=\;0$ $x\;=\;7.94\cdot 10^{-6} $
pH ?
$pH\;=\;-log\; x\;=\;5.10$
