paved88

Wow yeah I figured that's what I was supposed to do. Thanks so much!

This is a question I have for my lab report "Determining the Enthalpy of a Chemical Reaction". I feel like the answer is probably right in front of my face, I just don't know how to start. The first data analysis problem was to find q of each reaction, which I was able to do. Then it instructs me to "calculate the enthalpy change, ΔH, for each reaction in terms of kJ/mol of each reactant". I understand what enthalpy is, for the most part, but I don't really know what to do. You find the enthalpy change for a reaction as the enthalpy of the products - the enthalpy of the reactants, right? But I don't know how to calculate the enthalpy change for each reactant, is that a given value? I know that there are given thermodynamic values available for me to calculate that; is that all I do? I know the names of the products and reactants for each reaction, so do I need to do ΔHreaction = ΣΔHf (Products) - ΣΔHf (Reactants), or is there something I need to do involving the heat energy (q) of the reactions? This is for AP Chemistry, a high school course. Please help if you can, thank you.

Lol. I think I get the point about the ammonia dissolving. TWJian, thanks for all the advice in your second post. I turned in the paper earlier today, but it will help me know what to research if I do a follow up experiment next year. I was able to incorporate a lot of the information in your first post, so thanks a lot. I was afraid I wouldn't have anything substantial to include in my conclusion, since my library access was taken for the year and I couldn't look anything up in there. I'll probably follow this up next year in AP Chemistry. Thanks a lot everyone.

Ah, I should've thought to include a list of all the solutions when I posted this originally. The acidic solutions were sprite and vinegar, and the acidic solutions were bleach and ammonia, using water as a control. TWJian, so basically the rate of the chemical reaction depends on certain ions in the solvents that the solute may be reacting with? It looks like the jolly ranchers were reacting with OH- (assuming they are present) in the bleach and ammonia respectively? Isn't NH3 the chemical formula for ammonia? Thanks, by the way.

Basically, my friend and I conducted an experiemtn for 10th grade chem in which we used five liquids with different pH levels and measured the time it took for different liquids to dissolve a Jolly Rancher. I'm working on the final paper, and most of it is straight forward, but I can't find any information on the relationship between the pH of solvents and the time it takes to dissolve solutes. Does anyone know of any similar experiments or about the relationship (if there is one)? We found that the more alkaline solvents dissolve the candy faster, which wasn't what we expected. Does it depend on the solute? Can anyone help?

Basically, my friend and I conducted an experiemtn for 10th grade chem in which we used five liquids with different pH levels and measured the time it took for different liquids to dissolve a Jolly Rancher. I'm working on the final paper, and most of it is straight forward, but I can't find any information on the relationship between the pH of solvents and the time it takes to dissolve solutes. Does anyone know of any similar experiments or about the relationship (if there is one)? We found that the more alkaline solvents dissolve the candy faster, which wasn't what we expected. Does it depend on the solute? Can anyone help?