An endothermic reaction

An easy reaction you can do at home with cooking ingredients.

Mix approximately equal quantities of bicarbonate of soda, (sodium hydrogen carbonate) with some citric acid. Add water and the reaction will start. The reaction is endothermic, so the mixture and container cools down. Sodium citrate, carbon dioxide and water are the products, which have a total entropy greater than that of the reactants and surroundings. This allows this reaction to be spontaneous, even though it is endothermic.

Category:

Science & Technology

Tags:

• endothermic
• citric
• acid
• baking powder
• bicarbonate
• soda
• reaction
• chemistry

[kavitha270993]

Thtz awesome! :D Cn yu tel hw long does it stay cold?!

[17YOchem]

@kavitha270993 Im not sure, this would depend on the solution's heat capacity and what you mean by cold :)... but it would stay below room temperature for at least 10 minutes

[merolizer]

what do u mean by "sub-zero"?

please reply quickly i need these for a science project.

[GrapeKingProductions]

so if u can reach subzero how much to absolute zero :P 

[ymusthisvsoo]

this is great!!!! :D this is just what I needed to finish my stupid lab report thanx

[lewisadams42850]

BTW water is not needed when vinegar is used

only for the citric acid as it is in solid form lool

[lewisadams42850]

this reaction also works with vinegar (ethanoic acid- CH3COOH)

vinegar has a molar concentration of 0.85 moles per Dm

if you had 100ml of vinegar there is 0.085 moles

CH3COOH + NaHCO3--------> CH3COONa + H2O + CO2

so would need 0.085 moles of NaHCO3

SO 0.085 X 84 = 7.14

so you would need 7.14g of bicarbonate soda for 100ml of vinegar

[01716245502]

can you tell me at least how many grams of reactants you used and also the amount (mL) of water ??

[9444555555]

Martin would be proud