When Values of K_a Are Small (E $\times$ 10^-5)and Concentrations of Weak Acids [HA] Are Relatively Large (E

question 217

Multiple Choice

When values of K_a are small (e.g.,1 $\times$ 10^-5) and concentrations of weak acids [HA] are relatively large (e.g.,0.10 M) ,the hydronium ion concentration of the solution can be calculated using which expression?

• A)[H⁺] = K_a
• B)[H⁺] = K_a[HA]
• C)[H⁺] = (K_a[HA])
• D)[H⁺] = K_aK_b[HA]
• E)[H⁺] = K_a[HA]/[A^-]

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