The Following Question Refers to a Solution That Contains 1 $\times$

question 98

Multiple Choice

The following question refers to a solution that contains 1.59 M hydrofluoric acid,HF (K_a = 7.2 $\times$ 10^-4) ,and 3.00 M hydrocyanic acid,HCN (K_a = 6.2 $\times$ 10^-10) . What is the pH of this mixture of weak acids?

• A)1.47
• B)2.94
• C)4.50
• D)9.01
• E)12.53

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A legal principle that prevents a promisor from retracting a promise when the promisee has reasonably relied on the promise to their detriment.

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