Answer:
Ka = 1.62x10^-12
Explanation:
The smaller the number the weaker it is. If Ka > 0 it is a strong acid, if Ka < 0 it is a weak acid. I also just took the test.
The following ka values that represent the weakest acid is Ka = 1.62 x 10⁻¹². The correct option is D.
The acid dissociation constant is the equilibrium constant of an acid's dissociation reaction. It is denoted by ka.
The increased the Ka, the more the acid dissociation. Strong acid dissociate into water.
Thus, the correct option is D. Ka = 1.62 x 10⁻¹².
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