We made t-pentyl Chloride in Lab today using HCl and t-pentyl alcohol. I know t-pentyl chloride is not soluble in water, but I'm still not sure the answer to some of my post lab questions. I've answered a few, but I have 3 that still confuse me. We performed a water extraction followed by an extraction with 5% NaHCO3.

1) What impurity or impurities does the water extraction remove?

2) What impurity or impurities does the NaHCO3 extraction remove?

and 3) Why is the water extraction done before the NaHCO3 extraction?

I believe NaHCO3 removes some of the excess HCl, but I'm not confident enough and I'm not sure if that's the only thing it removes. Please help!