# Dissolving of Salt in Water Na ions Water

• Slides: 15

Dissolving of Salt in Water Na+ ions Water molecules Clions Na. Cl(s) + H 2 O Na+(aq) + Cl-(aq)

Determine the minimum amount of salt needed to make a golf ball float in 100 m. L water. Weigh out 50. 0 g of Na. Cl Add 5 g additions of salt to the water, dissolve, check to see if ball floats. Continue with this method of successive additions until ball floats. Re-weigh remaining salt and subtract this amount from 50. 0 g to determine the amount of salt needed. Finally, repeat…begin 5 g less salt and add 1 g increments to narrow range. Trial Salt (g) Total Float /Sink 1 5. 0 g Sink 2 5. 0 g 10. 0 g Sink 3 5. 0 g 15. 0 g Sink 4 5. 0 g 20. 0 g Sink 5 5. 0 g 25. 0 g Float

Theorize, but Verify …We must trust in nothing but facts. These are presented to us by nature and cannot deceive. We ought in every instance to submit our reasoning to the test of experiment. It is especially necessary to guard against the extravagances of imagination which incline to step beyond the bounds of truth. Antoine Laurent Lavoisier, 1743 - 1794 Jaffe, New World of Chemistry, 1955, page 1

Theory Guides, Laboratory Decides! Density of water = 1. 0 g/m. L Need to determine density of a golf ball. mass =______ g (electronic balance) volume = ______ m. L (water displacement method) or formula? Density of golf ball cannot be made to decrease. Therefore, you need to increase the density of the water by dissolving salt into the water. Limiting Factor: accurate determination of volume of golf ball Solubility Curve of salt in water. Water has a limit to how much salt can be dissolved. Saturation – point at which the solution is full and cannot hold anymore solute.

Packing of Na. Cl Ions Electron Microscope Photograph of Na. Cl

Dissolving of Salt in Water Na+ ions Water molecules Clions Na. Cl(s) + H 2 O Na+(aq) + Cl-(aq)

Dissolving of Salt in Water Na+ ions Water molecules Clions Na. Cl(s) + H 2 O Na+(aq) + Cl-(aq)

Dissolving of Salt in Water Na+ ions Water molecules Clions Na. Cl(s) + H 2 O Na+(aq) + Cl-(aq)