# Chemistry

What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 6.25m? The density of the solution is 1.2219 g/mL

1. 👍 0
2. 👎 0
3. 👁 504
1. molarity is the number of moles per unit volume (L).

6.25 m means 6.25 moles per L of solution, or per 1221.9 g of solution.

Calculate the mass density accordingly.

1. 👍 0
2. 👎 0
2. Do you have a 6.25m or a 6.25M solution? Mathmate's answer and definition is for 6.25M.

The correct answer for 6.25m is below.
m is molality and the problem states molality (not molarity).
molality = mols solute/kg solvent.
6.25m means 6.25 mols NaOH/kg solvent.
g = mols x molar mass = 6.25 x 40 = about 250; therefore, you have a solution of 250g NaOH in (1000 + 250) or 250 g NaOH in 1250 g solution.
mass% = (250/1250)*100 = ?about 20%

1. 👍 0
2. 👎 0
3. Thank you Dr. Bob.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### chemistry

what is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 4.37M? the density of the solution is 1.1655 g/mL.

asked by Anonymous on April 22, 2014
2. ### Physical Chemistry

Calculate the concentrations of each of the following solutions. (a) the molality of chloride ions in an aqueous solution of iron(III) chloride for which xFeCl3 is 0.0195 (b) the molality of hydroxide ions in a solution prepared

asked by Trixie on February 15, 2010
3. ### chemistry

an impure sample of oxalic acid C2O4H2, with a mass of 0.465g, is dissolved in water. a few drops of phenolphthalein indicator solution are added, and the solution is titrated with 0.190 mol/L aqueous sodium hydroxide held in a

asked by tarkan on December 24, 2010
4. ### chemistry

a sodium hydroxide solution was prepared according to the procedure outlined in this weeks experiment. This sodium hydroxide solution was standardized by by titration against exactly 10mL of a 0.28M hydrochloric acid solution. In

asked by Kacie on November 25, 2012
5. ### Science

What is the mass percent of sodium hydroxide in a solution that is made by dissolving 8grams of sodium hydroxide in 50 grams of H2O?

asked by Araceli on July 7, 2014
6. ### Chemistry

Sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. The densities of Na(s) and Hg(l) are 0.97 g/cm3 and 13.6 g/cm3, respectively. A sodium amalgam is made by dissolving 1.0 cm3 Na(s) in 20.0 cm3

asked by bernan on December 11, 2011
7. ### Chmistry

Sodium metal dissolves in liquid mercury to form a solution called a sodium amalgam. The densities of Na(s) and Hg(l) are 0.97 g/cm3 and 13.6 g/cm3, respectively. A sodium amalgam is made by dissolving 1.0 cm3 Na(s) in 20.0 cm3

asked by bernan on December 13, 2011
8. ### Chemistry

Aqueous sulfuric acid H2SO4 will react with solid sodium hydroxide NaOH to produce aqueous sodium sulfate Na2SO4 and liquid water H2O . Suppose 31. g of sulfuric acid is mixed with 11.5 g of sodium hydroxide. Calculate the maximum

asked by Tre on April 9, 2016
9. ### Chemistry

aqueous sulfurous acid H2SO3 was made by dissolving 0.200 L of sulfur dioxide gas at 19 C and 745 mm Hg in water to yield 500.0 ml of solution. the acid solution required 12.9 ml of sodium hydroxide solution to reach the titration

asked by Sierra on February 20, 2011
10. ### Chemistry

Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water. Suppose 61. g of hydrobromic acid is mixed with 41.1 g of sodium hydroxide. Calculate the maximum mass of water

asked by Ryan on January 15, 2016

More Similar Questions