To what extent does the $pH$ increase or decrease with each of the following additions? Select the single best answer for each part.

Part $1$ of $4$

$5$ drops of $0\mathrm{.}1$MKOH added to $100mL$ of $0\mathrm{.}5M$ buffer.

Increases to a small extent

Decreases to a small extent

Decreases to a large extent

Increases to a large extent

Part $2$ of $4$

$5$ drops of $0\mathrm{.}1MHN{O}_3$ added to $100mL$ of $0\mathrm{.}5M$ buffer.

Decreases to a small extent

Increases to a large extent

Decreases to a large extent