Which of the four solutions is the best buffer against addition of acid or base? a. na2hpo4 b. na2hpo4 + nah2po4 c. nah2po4 d. h2o submit for grading save and finish later?

b. Na2HPO4 + NaH2PO4.

A buffer is a solution of a weak acid and its conjugate base. The weak acid is H2PO4^(-) and its conjugate base is HPO4^(2-).

All the other options are incorrect because they consist of only a single component.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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