4.1

Dissolving a Solid in Water

NOTES

-orange solid=potassium dichromate

-We did not use this solid because it is very toxic and hard to dispose of.

-saturated solution: no more solid can be dissolved

-Experimental Errors:

1. Not shaking long enough

2. Water spills out



CUBES GET FILLED WITH SUGAR-NO MORE CAN BE DISSOLVED (Mr. Leeds reference to explaining how a saturated solution works


Blue-Dot Questions and Answers

1. Did all of the solids dissolve in both test tubes?

NO

2. Do you think that each cubic centimeter of solution contains the same mass of dissolved material? Explain.

NO BECAUSE THE COLOR OF THE ONE WITH 5 ML IS DARKER THAN THE ONE WITH 20 ML. IT IS MORE CONDENSE.

3. Will another 0.70 g of the white solid dissolve in each of the test tubes?

YES, IT ALL DISSOLVED.

4. Did 1.40 g of the white solid dissolve as well in 20 cm^3 as in 5 cm^3 of water?

YES, IT DID.

5. How much do you have in each test tube?

2.1 g

6. What do you observe?

THE 5 ML SUBSTANCE DID NOT DISSOLVE WHEREAS THE ONE IN 20 ML DID.

7. How much orange solid do you think there would have to be in the 20 cm^3 test tube before the solid stopped dissolving?

2.1x4= 8.4 g