Sodium Chloride and Solution
Instructions
You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning.
If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit.
This assignment must be submitted no later than November 22nd, 2011.
1. What is a true solution? Explain why the solute does not settle out of a solution.
Is it possible to have one solid dissolved in another? Explain.
In metals it would be called an alloy.
2. An aqueous solution of KCl is colorless, KMnO4 is purple, and K2Cr2O7 is orange. What color would you expect of an aqueous solution of Na2Cr2O7? Explain.
Orange.
3. Explain why hexane will dissolve benzene but will not dissolve sodium chloride.
Sodium chloride is an ionic compound.
4. Some drinks like tea are consumed hot or cold, whereas others like Coca-Cola are consumed only cold. Why?
For taste reasons, these drinks can be drunk if the user likes It but having coca cola like tea would be gross.
5. What is the effect of:
a) pressure on solubility of gases in liquids? pressure forces more gas into a liquid.
b) pressure on solubility of solids in liquids? _____________________________________________
c) temperature on solubility of gases in liquids? _____________________________________________
d) temperature on solubility of solids in liquids? _____________________________________________
6. Why do trucks distribute salt over icy roads in winter in the North? Explain.
This actually is interesting and since I lived up North I know that the truck don’t actually melt the ice but rather bring the temp of the ice melting point.
7. Will 1 L of 1 M NaCl contain mole chloride ions than 0.5 L of 1 M MgCl2? Explain. Support your answer by calculations.
They will contain the same number of chloride ions.
.5L( 1 mol MgCl2/L) ( 2 mol Cl-/1 mol MgCl2) = 1 mol Cl-
8. Describe step by step how you would
You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning.
If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit.
This assignment must be submitted no later than November 22nd, 2011.
1. What is a true solution? Explain why the solute does not settle out of a solution.
Is it possible to have one solid dissolved in another? Explain.
In metals it would be called an alloy.
2. An aqueous solution of KCl is colorless, KMnO4 is purple, and K2Cr2O7 is orange. What color would you expect of an aqueous solution of Na2Cr2O7? Explain.
Orange.
3. Explain why hexane will dissolve benzene but will not dissolve sodium chloride.
Sodium chloride is an ionic compound.
4. Some drinks like tea are consumed hot or cold, whereas others like Coca-Cola are consumed only cold. Why?
For taste reasons, these drinks can be drunk if the user likes It but having coca cola like tea would be gross.
5. What is the effect of:
a) pressure on solubility of gases in liquids? pressure forces more gas into a liquid.
b) pressure on solubility of solids in liquids? _____________________________________________
c) temperature on solubility of gases in liquids? _____________________________________________
d) temperature on solubility of solids in liquids? _____________________________________________
6. Why do trucks distribute salt over icy roads in winter in the North? Explain.
This actually is interesting and since I lived up North I know that the truck don’t actually melt the ice but rather bring the temp of the ice melting point.
7. Will 1 L of 1 M NaCl contain mole chloride ions than 0.5 L of 1 M MgCl2? Explain. Support your answer by calculations.
They will contain the same number of chloride ions.
.5L( 1 mol MgCl2/L) ( 2 mol Cl-/1 mol MgCl2) = 1 mol Cl-
8. Describe step by step how you would