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Ka of weak acid HA is 1.8 xx 10^(-4). If...

`K_a` of weak acid HA is `1.8 xx 10^(-4)`. If the pH of a buffer solution made up of HA and NaA of total molarity is 0.29 having ph=4.4, what is the molarity of HA?

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`0.2M`
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