When Values of K_a Are Small (E

question 1

Multiple Choice

When values of K_a are small (e.g., 1  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])^1/2
• D)[H ^ ]  K_aK_b[HA]
• E)[H ^ ]  K_a[HA]/[A ^ ]

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