School Laboratory preparation

In the school laboratory carbon(II)oxide can be prepared from dehydration of methanoic acid /Formic acid(HCOOH) or Ethan-1,2-dioic acid /Oxalic acid(HOOCCOOH) using concentrated sulphuric(VI) acid.

Heating is necessary

1. Write a balanced chemical equation for the reaction of oxalic acid and sulphuric acid in preparation of carbon ii oxide

2. What is the use of calcium hydroxide in the setup?