To prepare a solution of NaCl, you weight out 2.634 (±0.002) g and dissolve it in...

To prepare a solution of NaCl, you weight out 2.634 (±0.002) g and dissolve it in a volumetric flask whose volume is 100.00 (±0.08)mL. Express the molarity of the solution, along with its uncertainty, with an appropriate number of digits. [Molecular mass of NaCl, 58.443 (±0.001) g/mol].

Expert Solution

Find out the moles of NaCl weighed out = mass of NaCl weighed out/molar mass of NaCl = (2.634 g)/(58.443 g/mol) = 0.0451 mol.

Find out the molarity of the prepared NaCl solution as molarity = moles of NaCl/volume of solution in L = (0.0451 mol)/[(100.00 mL)*(1 L/1000 mL)] = (0.0451 mol)*(1000)/(100.00).(1 L) = 0.451 mol/L = 0.451 M

Next calculate the uncertainty in the measurement.

Uncertainty in mass weighed out = (0.002 g)/(2.634 g)

Uncertainty in molar mass of NaCl = (0.001 g/mol)/(58.443 g/mol)

Uncertainty in volume = (0.08 mL)/(100.00 mL)

Let the uncertainty in measurement of concentration is u(c) where c = 0.451 mol/L is the concentration.

Therefore,

[u(c)/c]² = (0.002/2.634)² + (0.001/58.443)² + (0.08/100.00)² = 1.2168*10^-3

===> [u(c)/c] = √(1.2168*10^-6) = 1.1031*10^-3

===> u(c) = 1.1031*10^-3*c = 1.1031*10^-3*0.451 M = 4.975*10^-4 M

The molar concentration of prepared NaCl is 0.451 0.0004975 M (ans).

queen_honey_blossom answered 1 year ago

To prepare a solution of NaBr, you weigh out 2.639 (±0.003) g and dissolve it to...

To prepare a solution of NaBr, you weigh out 2.639 (±0.003) g and dissolve it to specification in a volumetric flask whose volume is 100.00 (±0.08) mL. Express the molarity of the solution, along with its uncertainty, with an appropriate number of digits.

1. How much Sodium chloride (NaCl), in grams, would you need to prepare 100 mL of a 0.2 M NaCl solution, giving the molecular weight for NaCl is 58.4 g/mole?

1. How much Sodium chloride (NaCl), in grams, would you need to prepare 100 mL of a 0.2 M NaCl solution, giving the molecular weight for NaCl is 58.4 g/mole? 2. How much glucose, in grams, would you need to prepare 25 mL of a 24% glucose solution? 3. How much stock solution would you need to make 50 mL of a 86 mM Potassium chloride (KCl) solution, given the stock solution is 1 M?

Problem: You weigh out a piece of copper wire (AW=63.546): Weight of copper standard....................0.2785 g Dissolve...

Problem: You weigh out a piece of copper wire (AW=63.546): Weight of copper standard....................0.2785 g Dissolve it in a slight excess of concentrated nitric acid. Add to the solution the required amount of concentrated ammonia. Transfer this quantitatively to a 100 mL volumetric flask, dilute to volume, and mix thoroughly. 10.00 mL of this is pipetted into a 100 mL volumetric flask, the required amount of concentrated ammonia is added and diluted to volume. This is Standard 1. Standard 2...

An aqueous NaCl solution is made using 124 g of NaCl diluted to a total solution...

An aqueous NaCl solution is made using 124 g of NaCl diluted to a total solution volume of 1.05 L . calculate molarity, caluclate molality. calculate mass percent.

(a) How do you prepare a 0.094% NaCl solution? (b) Tell whether the solution in the...

(a) How do you prepare a 0.094% NaCl solution? (b) Tell whether the solution in the medium outside of the cell is hypertonic, isotonic or hypotonic to the cell. # Inside the Cell Outside of the Cell in the Medium 1 0.009% NaCl 0.009% NaCl 2 0.076% NaCl 0.077& NaCl 3 0.02% NaCl 0.002% NaCl 4 0.09% NaCl 0.009% NaCl

Describe how you would prepare 2 mL of solution containing NaCl, MES buffer, and water. NaCl...

Describe how you would prepare 2 mL of solution containing NaCl, MES buffer, and water. NaCl stock solution is 1M and the working concentration required is 5mM. MES buffer stock solution is 100 M and the working concentrations required is 20 mM. To make 2 mL of solution calcualte the amount of water you would add. Please Show Work

Calculate the mass percent of a NaCl solution in which 141 g of NaCl is dissolved...

Calculate the mass percent of a NaCl solution in which 141 g of NaCl is dissolved in 4.00 L of water at 25 ∘C (density = 0.997 g/mL). Express your answer numerically.

(a) 3.25 M NaCl solution (density of solution = 1.08 g/mL)

Calculate the molality of each of the following aqueous solutions. (a) 3.25 M NaCl solution (density of solution = 1.08 g/mL) m (b) 51.4 percent by mass KBr solution m

29. You were trying to prepare 1.0 liter of a 1.0M solution of NaCl. By mistake...

29. You were trying to prepare 1.0 liter of a 1.0M solution of NaCl. By mistake you went over the desired final volume and the final volume of the solution was 1.2 liter. What is the actual concentration of the solution? The molecular weight of NaCl is 56 g/mol.

1. How many grams of NaCl are required to prepare 500. ml of 1.20M NaCl solution?...

1. How many grams of NaCl are required to prepare 500. ml of 1.20M NaCl solution? 2. ) Write the balanced equation for the reaction that occurs when sulfuric acid, H2SO4 is titrated with the base, sodium hydroxide, NaOH. Sodium sulfate, Na2SO4 is the salt produced. 3. SO2 gas is in a 2.0L flask at STP (0 o C, 1 atm). A. Using the Ideal Gas Law, determine the concentration of the gas in moles/L B. Calculate the density of...

Question