Question

look at the reaction below.
h₂so₄(aq) + ca(oh)₂(aq)→caso₄(aq) + 2h₂o(l)
which substance is the base in the reaction?
○ 2h₂o (l)
○ h₂so₄ (aq)
○ caso₄ (aq)
○ ca(oh)₂ (aq)

Explanation:

In an acid - base reaction (neutralization reaction), a base is a substance that donates hydroxide ions ($\ce{OH^{-}}$) or accepts protons ($\ce{H^{+}}$). $\ce{Ca(OH)_{2}(aq)}$ is a base because it contains hydroxide ions ($\ce{OH^{-}}$) and in this neutralization reaction with the acid $\ce{H_{2}SO_{4}(aq)}$, it donates $\ce{OH^{-}}$ ions. $\ce{H_{2}SO_{4}(aq)}$ is an acid (donates $\ce{H^{+}}$), $\ce{CaSO_{4}(aq)}$ is a salt (product of neutralization), and $\ce{2H_{2}O(l)}$ is also a product of the neutralization reaction.

Answer:

D. $\ce{Ca(OH)_{2}(aq)}$