Hi folks,
Today we took a quick look at a number of topics related to chemistry and biology. We looked at acids and bases, buffers, salts, and dynamic equilibrium. We also looked at solubility and concentration and conducted a quick lab to find the solubility of salt and sugar in 100g of water.
Homework due 10/5
Read pages 35 - 44 in the text book
Do questions #'s 10 - 19 on page 46
I'd also like you to do a lab report based on the lab report template I've included in this email.
The template should be rather self explanatory but here are some specifics to help you out.
1. For the hypothesis, state whether you originally felt that more salt or more sugar would dissolve in the solvent.
2. The data table will be rather short with just the grams of sugar and grams of salt that dissolved.
3. The graph should be a bar graph with the mass of salt and the mass of sugar that dissolved.
4. For your conclusion, I'd like you to state which substance was more soluble and whether or not that matched your hypothesis. I'd also like you to do an percentage error calculation. Percentage error is calculated by comparing your findings to known findings. The formula is (your results - actual results/actual results) x 100. You are hoping for a 0% error. Don't worry about whether the answer is positive or negative. The solubility of salt is 35.7 g/100 mL water at 20°C. Sugar is 206g/ml water at 20°C. If you find a large percentage error, try to give some explanation as to why your results were off.
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