Use the 5% rule to determine whether or not the equilibrium concentration of the acid can be approximated by its makeup concentration.
(a) 0.76 M cyanic acid (HCNO, pKa = 3.46)
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The approximation is valid.
The approximation is not valid.
(b) 0.0053 M hydrazoic acid (HN3, pKa = 4.60)
WebAssign will check your answer for the correct number of significant figures. %
The approximation is valid.
The approximation is not valid.
(c) 6.5 M arsenic acid (H3AsO4, pKa = 2.26)
WebAssign will check your answer for the correct number of significant figures. %
The approximation is valid.
The approximation is not valid.
