How would your calculated percent NaHCO3 change if you handled your crucible wit

Question

How would your calculated percent NaHCO3 change if you handled your crucible with you dirty fingers and did not your tongs? Answer increase, decrease or remain unchanged and justify your answer. You assume that you are only handling the crucible when it is at room temperature. How would your calculated percent NaHCO3 change if you handled your crucible with you dirty fingers and did not your tongs? Answer increase, decrease or remain unchanged and justify your answer. You assume that you are only handling the crucible when it is at room temperature. How would your calculated percent NaHCO3 change if you handled your crucible with you dirty fingers and did not your tongs? Answer increase, decrease or remain unchanged and justify your answer. You assume that you are only handling the crucible when it is at room temperature. How would your calculated percent NaHCO3 change if you handled your crucible with you dirty fingers and did not your tongs? Answer increase, decrease or remain unchanged and justify your answer. You assume that you are only handling the crucible when it is at room temperature.

Explanation / Answer

1) 1st possibility - using moisture from your hand

Baking Soda starts to decompose into Washing Soda , Carbon Dioxide and Water at room temperature when mixed with water, although the reation is slow . This the reason why it is advised not store in open container.

2 NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g)

So NaHCO3 percentage will decrease.

2) 2nd possibility - If your hands are wet then it may decompose into the following way at room temperature.

NaHCO3 (diluted) + 4H2O = [Na(H2O)4]+ + O3-

O3- + H2O H2CO3 + -.

3)3rd possibilty

By handling it with our dirty hands , we may add some extra mass to the sample like oil, dirt , dead skin etc. i.e. basically we have contaminated our mixture , any residue with our hands has mixed with the substance.

So calculated mass of NaHCO3 will not change but calculated percentage of NahCO3 may change.

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