Lab #7 - Hydrogen Bonding in Slime
Introduction: Two clear liquids are mxed. The result is a shimmery fluid polymer that can be shaped, that flows and that will sheer if twisted quickly.
2. Sodium tetraborate is a 4% solution: Add 4 grams of sodium borate, Na2B4O7.10H2O, to 100 mL of water.
2. Measure 7-8 mL of sodium tetraborate solution into another small beaker and observe its properties.
3. Choose a food colouring and add 1 drop of the food colouring to the sodium tetraborate solution.
4. Pour sodium tetraborate slowly into the polyvinyl alcohol solution while stirring vigorously with a wooden stick.
5. Examine the properties of the cross-linked polymer.
6. Experiment to see how far the polymer will flow from your hand.
2. The borate forms a complex structure called tetraborate, B4O5(OH)42-, that links the poly vinyl alcohol polymer strands together with hydrogen bonds.