A student adds 10 mL of hydrochloric acid to a 20 ml sodium hydroxide solution. What will most likely happen to the pH of the solution?

The pH decreases

Explanation:

- Hydrochloric acid, as an acid has a pH value below 7

- Sodium hydroxide, as an alkali has a pH value above 7.

The alkali neutralizes the acid to give a salt as in the equation:

HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l)

Hence, the aqeous sodium chloride, NaCl has a pH value of 7 (neutral) which is then a decrease from the above 7 pH value of the sodium hydroxide solution.

Thus, the pH decreases

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that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )