Question

question 11
1 pts
when a base is added to water, the ph should ______.
○ decrease
○ increase
○ stay the same.
○ cant tell without testing.
question 12
1 pts
we call a molecule that binds up excess hydrogen ions in a solution
a(n) ______.
○ donator
○ base
○ beta - particle
○ isotope
○ acid

Explanation:

Question 11

Bases increase the hydroxide ion ($OH^-$) concentration in water. pH is calculated as $-\log[H^+]$, and $[H^+][OH^-] = 10^{-14}$ at 25°C. Adding a base increases $[OH^-]$, so $[H^+]$ decreases, and since pH is based on $[H^+]$, a lower $[H^+]$ means a higher pH. So the pH should increase.

A base is a substance that can accept (bind) hydrogen ions ($H^+$) in a solution. A donator would give $H^+$, an acid donates $H^+$, a beta - particle is a type of radioactive decay particle, and an isotope is a variant of an element with a different number of neutrons. So the molecule that binds excess $H^+$ is a base.

Answer:

B. increase

Question 12