Question

In the laboratory, you have a beaker containing 100 milliliters (mL) of NaOH solution at pH = 13. Into this beaker, you carefully pour 10 mL of HCI at pH = 1. Which of the following statements best describes how the original contents of the beaker will be changed by this mixing?
a. At 25 °C, the product of [Ht] and [OH] will be 10 -12 after mixing.
b. The concentrations of H+ and OH- ions will become equal.
c. The pH of the beaker's contents will increase.
d. The pH of the beaker's contents will decrease. O E. The concentration of Na+ ions will increase.

Answer 1

Answer:

d. The pH of the beaker`s contents will decrease.

Explanation:

Since the new substance is an acid and has a very low pH, that is 1. it will reduce a little bit the pH of the original base (NaOH). Some ions of hydrogen of the acid are going to react with the hydroxyl group of the sodium hydroxide to form water.

Since the differences of the volume is big, only a small part of the base is going to be neutralize, but at the end, the final pH of the solution is still going to be  a base.

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