There isn't money left in most 2014-2015 science department budgets this late in the school year. For inexpensive chemistry lab ideas, buy my lab book Chemistry on a Budget for $20.56 at amazon.com or $23 at lulu.com. It will take a few weeks to get to you, so order now!
This book contains 13 labs using consumable materials purchased from local stores. There are two versions of each lab, one with a ten-question conclusion and one with directions for a full lab report. This way the teacher has the option! Each lab is two pages to allow for one two-sided handout.
I previously posted several pages about Solutions – on 3/19/14 Properties of Solutions, 3/23/14 Molarity, and 3/26/14 Vapor Pressure, BP/FP, and Molality.
All three posts contain a lot of information – if you haven’t viewed them, you might want to check them out!
Today, I’m going to focus on the Solubility Curve, a typical topic for Introductory Chemistry courses.
One definition is:
· Definition of SOLUBILITY CURVE. : a graphic representation of the variation with changing temperature of the solubility of a given substance in a given solvent.
From my 3/19/14 blog post:
The information of several solutions can be contained on a solubility curve, which is a graph of grams of solute (y-axis) dissolved in 100 g of solvent versus temperature (x-axis). Most of the lines are increasing (solid solutes) but sometimes the line is decreasing (gas solute).
Here is an image that shows how a solubility curve can be read, that the line plots the saturated solution, any point below is an unsaturated solution, and any point above the line would be for a supersaturated solution.
Here's one sample of a Solubility Curve:
This is a skill students master quickly – one twist in questions to increase difficulty could be changing the amount of solvent to prepare the solution (resulting in a changed solution concentration).
This worksheet has a Solubility Curve page and the answers!
This link has several pages of questions and Solubility Curves on some of the pages:
This page is two half-page worksheets, so you could save paper; and, it has the Solubility Curve on the page. It contains 11 questions – perhaps you could use it as a Quiz:
This link is just 2 pages, questions and a Solubility Curve, for easy photocopying (one 2-sided page):
Typical labs for the Solubility Curve is to prepare a Curve from student data. Check in your department to see what has been done.
Here’s a quick video to provide an ov
Instruct your students to be careful when stirring with the thermometer! Stir in a circular fashion – up and down could accidentally break the test tube!
Here’s one lab that also plots the correct values and instructs to draw the graph in a different color for easier comparison:
You may have to Copy and Paste it to print it out – it is 2 pages.
Here’s another 2-page lab:
If you can’t get potassium nitrate (KNO3), here’s a lab using sugar in water:
I like that it’s only one page!
Remember, you can check out the Topic List to help you to find past Blog entries.
Have a good weekend!