Bubble Lab!

Introduction:

Would the salt and sugar cause the bubbles to be different than the normal mixture?

A soap bubble is a very thin film of soapy water that forms a sphere with an iridescent surface. Soap bubbles usually last for only a few moments before bursting, either on their own or on contact with another object.

Hypothesis:

The sugar bubble will pertain a different color than the regular bubble and salt bubble. The salt bubble will have a clear effect to it and have no rainbow inside it.

Materials:

3 Drinking cups

1 tsp. of liquid dish detergent

1/2 tsp. of table sugar

1/2 tsp. of table salt

3 straws

1 spoon

2/3 cup of water to go in each cup

Procedures:

1. Label  3 drinking cups 1,2, and 3 and measure and add 1 tsp. of liquid dish detergent to each cup. Use measuring cup to add 2/3 of a cup of water then swirl the cups with a spoon to form a clear mixture.

2. Add 1/2 tsp. of table sugar to cup 2 and 1/2 tsp. of table salt to cup 3. Swirl each cup for a minute.

3. Dip the straw into cup one and remove it and blow gently into the straw to make large bubbles. Practice your bubble blowing.

4. Repeat step 3 with the mixtures in cups 2 and 3.

Data:

The normal mixture bubble  (teacher approved)

The sugar bubble 

The salt mixture would not form a bubble.

In doing this experiment we realized many errors could have occurred like the mixture could be different from what they should be because we used a spoon instead of an actual measuring cup.  Also different people were blowing bubbles which could change the consistency of the bubbles being formed.

Discussion:

The normal bubble would form a bubble then fall off of the straw and pop.

The sugar bubble would stick to the straw and you would have to touch it in order for in to be popped. 

The salt mixture did not blow bubbles.

Conclusion:

We reject our hypothesis because it had nothing to do with the color, but it dealt with how long the bubble would last.  The Reason that the soap mixture with sugar lasted longer is because how long a bubble lasts depends on how quickly the surface dries. Glycerin slows down the drying process and that's exactly what sugar is made out of. It allowed the surface to stay wet longer and not dry as quickly.  The salt mixture wouldn't allow a bubble to form because as soon as you tried to blow a bubble the surface would dry very quickly and just pop.