A teacher prepares a saturated NaCli solution at 55 Degree C. What is the % by mass 9m/m0 of this solution? what is the concentration of this solution expressed in ppm? What is the molality of this solution? If the density of the solution is 1.07 g/ml, what is the % m/v of this solution? If the density of this solution is 1.07 g/ml, what is the molarity of this solution?
I have this table called Solubility vs. Temperature (Reference tables for Physical setting/chemistry)
and I don't know if i have to use that or not
You have to us the table to get how much salt is in how much water. Saturated is on the line.
To determine the % by mass (mass/mass) of the saturated NaCl solution, we need to use the solubility data from the table you mentioned. Since the solution is prepared at 55 degrees Celsius and is saturated, we can find the solubility of NaCl at that temperature.
- Look up the solubility of NaCl in grams per 100 grams of water at 55 degrees Celsius in the "Solubility vs. Temperature" table.
- Let's say the solubility of NaCl at 55 degrees Celsius is 39 g/100 g of water.
Now, we can calculate the % by mass of the solution.
- The % by mass formula is (mass of solute / mass of solution) × 100.
- The mass of solute is the amount of NaCl in the solution, which is given by the solubility.
- The mass of solution is the sum of the mass of water and the mass of solute.
For example, if we have a 100 g solution:
1. Calculate the mass of NaCl (solute) using the solubility:
Mass of NaCl = (39 g NaCl / 100 g water) × 100 g water = 39 g NaCl
2. Calculate the mass of the solution:
Mass of solution = mass of water + mass of NaCl
= 100 g water + 39 g NaCl = 139 g solution
3. Calculate the % by mass:
% by mass = (39 g NaCl / 139 g solution) × 100% = 28.1% (rounded to one decimal place)
So, the % by mass (m/m0) of this saturated NaCl solution is approximately 28.1%.
To calculate the concentration of the solution expressed in parts per million (ppm), we can use the fact that 1 ppm is equivalent to 1 mg/L.
- The concentration in ppm is calculated as (mass of solute / volume of solution) × 10^6
If we know the density of the solution, we can use it to find the volume of the solution.
For the molality of the solution, we need to know the number of moles of solute (NaCl) per kilogram of solvent (water).
- The molality (m) is calculated as (moles of solute / mass of solvent in kg)
To calculate the % m/v (mass/volume) of the solution, we need to know the mass of solute (NaCl) in grams and the volume of the solution in milliliters.
- The % m/v formula is (mass of solute / volume of solution) × 100.
Finally, to find the molarity of the solution, we need to know the number of moles of solute (NaCl) and the volume of the solution in liters.
- The molarity (M) is calculated as (moles of solute / volume of solution in liters).
I hope this helps you understand how to approach the problem and use the given table to calculate the various concentrations of the solution.