Buffer consists of 0.50 M NaH2PO4 and 0.40 M Na2HPO4. Phosphoric acid is a triprotic acid (K a 1 = 7.2 × 10 − 3, K a 2 = 6.3 × 10 − 8, and K a 3 = 4.2 × 10 − 13). (a) Which Ka value is most important to this buffer? (b) What is the buffer pH?

The Ka value used for the buffer system is :- Ka2 = pKa2 = 7.2

pH = 7.1

Explanation:

The buffer system given in the question is :-

and

The reaction taking place is:-

The Ka value used for the buffer system is :- Ka2 = pKa2 = 7.2

The pH can be calculated as:-

pH = 7.2 + log 0.40/0.50 = 7.1

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.