Unfamiliar things in chemistry/ things that I get confused on

What is the chemical formula for sodium sulphate ?

Na₂SO₄

Nitrate

^NO₃-

How to calculate concentration using mass and volume?

If you are given the mass, you can do mass/mr and then you get moles. Do moles over volume to get your answer.

A student rinsed the apparatus before starting an acid-base titration.

The results of the titration showed that the volume of acid added from the burette was larger than expected.

Which is a possible reason for this?

The burette was rinsed only with water.

What is the scientific name for vinegar?

Acetic acid.

Purpose of aspirin.

Medications.

What is the conversion of miligram to grams?

Mg x 10^-3 = g