Phosphoric acid ionizes in three steps with their ionization constant values K _ a _1 , ~K _ a _2 and K _ a _3 , respectively, While K is the overall ionization constant. Which of the following statements are true? A. K = K _ a _1 + K _ a _2 + K _ a _3 B. H _3 PO _4 is a stronger acid than H _2 PO _

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Phosphoric acid ionizes in three steps with their ionization constant values K _ a _1 , ~K _ a _2 and K _ a _3 , respectively, While K is the overall ionization constant. Which of the following statements are true? A. K = K _ a _1 + K _ a _2 + K _ a _3 B. H _3 PO _4 is a stronger acid than H _2 PO _4^ - and HPO _4^ 2- C. K_ a_1 K_ a_2 K_ a_3 D. K _ a _1 = K _ a _3 + K _ a _2 2 Choose the correct answer from the options given below:

Quantrex Academy · Accepted Answer

Correct answer: D. A, B and C only

For polybasic acid, order of ionization constant is Ka _1 Ka _2 Ka _3 because as negative charge increases, tendency to loose H ^ + ions decreases. Overall K = Ka _1 Ka _2 Ka _3 Taking log on both sides K = Ka _1+ Ka _2+ Ka _3

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