In order to adjust the buffer ph to 4.20, should you add naoh or hcl to the buffer mixture?

In order for one to adjust the pH of a buffer mixture to a pH of 4.20, one should add HCl to the mixture. This is because the preferred pH is at the acidic range and you should be adding an acid to reach this pH. When adding a base, the pH will be farther from the desired one.

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Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.