29 August 2017 Science 8 Examine density of liquids data; Make saturated solutions of sugar and salt; Find the densities of the saturated solutions; Saturated solutions and crystallization

See previous blogpost:

Examine the density data:<https://docs.google.com/a/aes.ac.in/spreadsheets/d/1akCEeG7ARiZtiFkPaWL3SdewOI0vYHVNHvGVIeydZ84/edit?usp=sharing>. If you have not entered your data, you need to do so asap. You will need to let Dr. F know when you are ready so he can give you editing privileges.

Making histograms of the density values. Follow good graphing practices. A demonstration.

We will begin making saturated solutions of table salt and white sugar. Use 100 ml of heated water from the kettle. We will take the temperature at the time you get the water. (It will cool while you dissolve the substances.) Keep track of how much salt you add to the 100 ml of water. Add until no more dissolves. Try not to add to much excess. When no more dissolves, the solution is saturated.

What method can you use to determine how much salt or sugar you have added?

When you feel the solution is saturated, find the density of  a 50 ml sample. Do not let any of the undissolved substance get into the cylinder. Enter data: https://docs.google.com/a/aes.ac.in/spreadsheets/d/1jTcyipK0fb_lzh-0ekJixNblGBHENb3bXqVK9r-QWZs/edit?usp=sharing

Pour a little of your saturated salt solution in a petri dish labeled with your names, period, date and time. Set it on the counter top at the back of the room to allow the water to evaporate and the substance to come out of solution–precipitate–as crystals.

Make saturated solutions of other substances provided. Pour a little of your saturated solution in a petri dish labeled with your names, period, substance, date and time. Set it on the counter top at the back of the room. You can set up one petri dish  / substance.

Take pictures.

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