Molarity Calculations
What is the equation for Molarity?
M = mole solute / L solution
What is the equation used for Dilutions?
M1V1 = M2V2 or C1V1 = C2V2
How do you calculate equivalents?
Based on the charge of the ion.
OR
The number equivalents per mole of an ion = charge of ion
What is the equation for Percent Composition, (W/V %), an (V/V %)?
Percent Comp: mass solute (g) / mass solution (g) x 100%
(W/V %): mass solute (g) / volume solution (mL) x 100%
(V/V %): volume solute (mL) / volume solution (mL) x 100%
What is the phrase you need to have memorized?
"Like dissolves Like"
What is the Molarity of an intravenous glucose solution prepared from 108 g of glucose in 2.0 L of solution?
0.30 M
What is the concentration of a solution formed by diluting 5.0 mL of a 3.2 M glucose solution to 40.0 mL?
0.40 M glucose solution
1 mol PO4^3-
3 Eq PO4^3-
What is the conversion factor for 5.0% (w/v) ketamine?
5 g ketamine / 100 mL solution
Which of these compounds are water soluble?
a) NaNO3
b) CH4
c) HO-C-C-OH (Cs have Hs attached)
d) KBr
e) NH2OH
a, c, d, e
What volume in mL of a 0.30 M solution of glucose contains 0.025 mol of glucose?
83 mL glucose solution
How many mL of a 6.0 M NaOH solution would be needed to prepare 750 mL of a 4.0 M solution?
5.0 *10^2 mL
How many equivalents of Sulfate (SO4^2-) are present in a solution that contains 3.2 moles of SO4^2-?
6.4 Eq SO4^2-
1.5 mL solution
What is a saturated solution? What is a unsaturated solution?
Saturated = max number of g of solute dissolved in solution
Unsaturated = less than max number of g of solute dissolved in solution
How many grams of aspirin are contained in 50.0 mL of a 0.050 M solution?
0.45 g aspirin
Ketamine is supplied in a solution of 100. mg/mL. If 2.0 mL of this solution is diluted to a volume of 10.0 mL, how much of the diluted solution should be administered to supply a dose of 75 mg?
3.8 mL
123 mEq Na+
Chloraseptic sore throat spray contains 0.35 g of the antiseptic phenol dissolved in 25 mL of solution. What is the weight/volume percent concentration of phenol?
1.4 % (w/v) phenol
What affects solubility?
Temperature and Pressure
How many mL of a 0.25 M sucrose solution that is containing 50.0 mg? The molar mass of sucrose is 343.30 g/mol.
0.58 mL
What is the concentration of a solution formed by diluting 15.0 mL of a 1.2 M glucose solution to 60.0 mL?
0.30 M
If a solution contains 12 mEq of Na+ per Liter, how many mL of solution contains 25 mEq of Na+?
2.0 x 10^2 mL
A 750-mL bottle of wine contains 101 mL of ethanol. What is the volume/volume percent concentration of ethanol?
14% (v/v) ethanol
Label each compound as water soluble or water insoluble:
a) C5H12
b) NaBr
c) NH3
a - water insoluble
b - water soluble
c - water soluble