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What can be a source of error in the results in an energy transfer in chemical...

What can be a source of error in the results in an energy transfer in chemical process NaOH and HNO3 lab?
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There can be multiple sources of error in the results of energy transfer in chemical process of NaOH and HNO3.

There can be error in measurement of masses , molarity or volume of one or both the reactants.

The energy might be lost of absorbed , if the system is not isolated , which can cause incorrect change in temperature according to the reaction.

The specific heat of calorimeter also plays a major role. If there is any error in the measurement , it can cause incorrect results again.

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