In this reaction:

2 HCl + Na2CO3 -> H2O + CO2 + 2 NaCl

The HCl was diluted from 2M to 0.8M and I currently have 0.020 L of it. There is also Na2CO3.

What would be four causes for a large error percentage?

Is it possible that some of the HCl evaporated?

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