Calculate the pH of a $ 0.20 \; M $ aluminum chloride solution ! Species influencing pH ?
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$Al(H_2O)_6^{3+}$ is a weak acid, $Cl^-$ has no effect on pH.
What is the initial molarity of $Al(H_2O)_6^{3+}$?
$c_{Al(H_2O)_6^{3+}}=0.20\;M$
Equation ?
With $x=[H_3O^+]$: $x^2\;+\;10^{-4.95}\;x\;-\;10^{-4.95}\;0.20\;=\;0$ $x\;=\;1.51\cdot 10^{-3} $
pH ?
$pH\;=\;-log\; x\;=\;2.82$
