WorksheetsSolutions and Solubility Review: Extra Credit
Total questions: 17
Worksheet time: 1hrs 25mins
Heart cells require a certain balance of sodium and potassium ions to function. The blood, which is approximately 83% water, carries these two types of ions to the heart. The property of water that allows it to carry ions to the heart is its—
molecular mass
specific heat
polarity
density
Which compound in this reaction is the precipitate?
3CaCl2 + 2Na2PO4 --> 6NaCl + Ca3(PO4)2
CaCl2
Ca3(PO4)2
Na2PO4
NaCl
Upon completion of a lab exercise, students examine the above data table. Which of the following conclusions is supported by this data?
CaCl2 is insoluble
NaCl is insoluble
Mg2CO3 is soluble
NaCl is more soluble than CaCl2
If a student wanted to make 350. mL of a 1.56 M solution of NaCl, how many grams of sodium chloride would they need to use?
9.34 g
31.9 g
224 g
546
A student made a 2.00 L solution using 86.3 g of sodium chloride. What is the molarity of the solution that the student made?
0.200 M
0.738 M
1.47 M
4.82 M
A solution is made using 32.0 g NaCl and 350. mL of water. What is the concentration of this solution?
1.56 M
5.34 M
192 M
655 M
Students working in lab use 52.3g of CaCl2 to make a solution. When the solution is brought to a final volume of 800. mL, what is the concentration?
0.139 M
0.153 M
5.88 M
0.632 M
A lab technician is called on to prepare 2.0L of a .9M saline solution. The lab has 2L beakers in stock. What steps must she follow to fill the order?
Add 116.9g of NaCl to 2.0L of water, stir until dissolved, then pour out any solution in excess of 2.0L.
Measure 105.2g of NaCl, pit it into the beaker, add enough distilled water to make 2.0L, and stir until dissolved.
Measure 58.4g of NaCl, add it to 2.0L of H2O already in the beaker, stir until dissolved
Pour tap water into the beaker until full, add 9.0g of table salt, then stir until dissolved.
A teacher is making diluted solutions for the lab. The stock solution is 200mL of 5M HCl. What volume will the teacher need to obtain a 2M solution?
30 mL
80 mL
100 mL
500 mL
When 50 mL of a 2M HNO3 solution is diluted to 200 mL of HNO3, what is the resulting molarity?
0.5 M
1.0 M
2.0 M
6.0 M
During a lab investigation of solutions, you find the distilled water container is empty. Your lab partner refills it from the faucet so you can make your solutions. You make up 5% solutions of table salt, table sugar, acetic acid, and baking soda in 500 ml beakers. A fifth beaker, the control, contains only water. When tested with a conductivity probe all five samples yield positive results. This is contrary to your expectations and every other lab group's observations. What can you conclude?
All the solutions you tested were electrolytes, and the control result is a mistake.
Every station must have had different solute samples.
The conductivity probe you used must be defective
The tap water contains ions that affected your results.
Potassium cyanide (KCN) is water soluble. Which of the following is not one of the ions present in the solution?
K*
CN-
OH-
C+
Two students decide to make rock candy at home. They have been studying solutions in chemistry class and hope to apply what they have learned. Their first attempt involves adding 10 grams of sucrose, table sugar, to 500 mL of water. They stir until all the sugar dissolves. Sugar is continually added 10 g at a time until no more dissolves.In fact some of the granules added last are seen in the bottom of the jar. What is the nature of this solution?
It is unsaturated
It is saturated
It is supersaturated
Not enough information provided.
Gases are most soluble in water under what circumstances?
High temperature and high pressure
High temperature and low pressure
Low temperature and low pressure
Low temperature and high pressure
The solubility of an unknown substance was tested during an experiment. Based on the solubility curve information and the results of the experiment, what is most likely the identity of this unknown solute?
NaCl
KCl
KNO3
NaNO3
Students are producing a sodium nitrate solution. How can the students increase the rate of solubility?
Increase the pressure
Increase the volume of solvent
Increase the temperature
Increase the amount of solute
For which of the following is pressure a factor in solubility?
Gases
Solids
Solids and gases
neither solids nor gases
