Question

Calculate the molarity of a solution containing 30.0 g of
ethanol (C2H5OH) in 6.00 L of solution.

What is the molarity of a solution containing 2.00 g of NaOH in
1000 mL of solution?

How many grams of sodium carbonate (Na2CO3) are needed to prepare
2.50 L of a 0.15 M solution?

How many grams of KOH are needed to prepare 100 mL of a 0.50 M
solution?

Lab 9 Worksheet: Concentration of Solutions (Ch4) Name:

How many mL of a 14.0 M stock solution must be used to make 250 mL
of a 1.75 M solution?

You have 200 mL of 6.0 M HF. What concentration results if this is
diluted to a total volume of 1 L?

100 mL of 6.00 M CuSO4 must be diluted to what final volume so that
the resulting solution is 1.50 M?

Water is added to 4.0 L of 6.0 M antifreeze until it is1.5 M. What
is the total volume in L and mL) of the new solution?

If we have 1 L of 3.0 M HCl, what is the molarity of the solution
if the acid is diluted to a volume of 6.0 L?

Answer #1

Molarity = moles of solute/Vol of solution in L

Ans.1

Mass of ethanol = 30g

Molar mass = 48.07g/mol

Moles = mass/molar mass = 30g/48.07g/mol = 0.624

Vol =6L

Molarity = 0.624mols/6L = 0.104M

Ans.2:

Mass of NaOH = 2g

Molar mass = 39.99g/mol

Moles = 2g/39.99g/mol = 0.05mol

Vol = 1000ml = 1L

Molarity = 0.05mol/1L = 0.05M

Ans.3:

Volume = 2.50L

Molarity = 0.15M

Molarity= moles/Volume in L

Moles = Molarity * Volume

Moles = 0.15*2.50 = 0.375mols

Molar mass of Na2CO3 = 105.98g/mol

Moles = mass/molar mass

So,mass of Na2CO3 = moles* molar mass =0.375moles*105.98g/mol =39.74g

MAss of Na2CO3 = 39.74g

Ans.4:

Molarity = 0.5M

Volume = 100ml = 0.1L

Moles = molarity*vol = 0.5*0.1 = 0.05moles

Molar mass of KOH = 56.11g/mol

Mass of KOH = moles* molar mass =0.05mol*56.11g/mol = 2.81g

Mass of KOH= 2.81g

Q1)
A 10.0 mL solution containing 0.15 g/L of Blue #2 dye is diluted
to a total volume of 100.0 mL. What is the concentration of the
diluted solution (in g/L)?
Q2)
A 10.0 mL solution containing 0.044 M of Blue #2 dye is diluted
to a total volume of 100.0 mL. What is the concentration of the
diluted solution (in M)?

Part A Calculate the molarity of a solution prepared by
dissolving 12.9 g of Na2CrO4 in enough water to produce a solution
with a volume of 670. mL .
Express the molarity to three significant digits
Part B
How many moles of KBr are present in 160. mL of a 0.127 M
solution?
Express the amount in moles to three significant digits
Part C
How many milliliters of 6.7 M HCl solution are needed to obtain
0.19 mol of HCl?...

1.
Vodka is advertised to be 80 proof, which is 40% by volume of
ethanol, C2H5OH. Assuming the density of the solution is 1.0 g/mL
and the density of ethanol is 0.789 g/mL. If the solution is at
25oC, what is the vapor pressure of water over the solution?
2. Calculate the molarity and molality of a solution of 50
grams of ethanol, C2H5OH (density = 0.789 g/mL) which is dissolved
in 200 mL of water (density = 1.00 g/mL).

A solution of ethanol (d=0.795 g/mL) and water (H2O) is prepared
by placing 30.0 mL of ethanol in a 250.0 mL volumetric flask and
diluting with water to the flask etched mark . (a) what is the
molarity of the ethanol in this solution? (b) Next, 25.o mL of the
solution above is diluted to a final volume of 500.0 mL, what is
the new molarity of the diluted solution?

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a.) What is the molarity of a solution prepared by dissolving
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b.) What volume of the solution in part (a) is required to
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