A commercially. Available. Sample of sulphuric acid is 15percent h2so4 by weight density 1.10gm per ml find molality and normality
To find the molality and normality of a solution of sulfuric acid, we need to understand a few concepts and equations.
Molality (m):
Molality is a measure of the amount of solute (in moles) per kilogram of solvent in a solution. It is given by the following equation:
Molality (m) = (moles of solute) / (mass of solvent in kg)
Normality (N):
Normality is a measure of the concentration of a solution based on the number of equivalents of solute per liter of solution. It is typically used for acid-base reactions. Normality can be calculated using the following equation:
Normality (N) = (number of equivalents of solute) / (volume of solution in liters)
To begin, we need to convert the given 15% solution of sulfuric acid into grams of H2SO4 per liter of solution.
Step 1: Calculating grams of H2SO4
Since the solution is 15% H2SO4, we know that 100 ml of the solution contains 15 grams of H2SO4 (as 15% means 15 grams of solute in 100 grams of solution).
Step 2: Calculating moles of H2SO4
To calculate the moles of H2SO4, we need to know the molecular weight of H2SO4. It is 98.09 g/mol. We can use this molecular weight to convert the grams of H2SO4 into moles:
moles of H2SO4 = (grams of H2SO4) / (molecular weight of H2SO4)
Step 3: Calculating molality (m)
We are given the density of the solution, which is 1.10 g/ml. This means that 1 liter of the solution will have a mass of 1.10 kg. We can use this to calculate the molality:
molality (m) = (moles of H2SO4) / (mass of solvent in kg)
= (moles of H2SO4) / 1.10 kg
Step 4: Calculating Normality (N)
To calculate the normality, we need to determine the number of equivalents of H2SO4. Sulfuric acid is a diprotic acid, meaning each molecule can donate 2 equivalents of acid. Therefore, the number of equivalents of the H2SO4 is twice the number of moles of H2SO4.
number of equivalents of H2SO4 = 2 * (moles of H2SO4)
Now we can calculate the normality:
normality (N) = (number of equivalents of H2SO4) / (volume of solution in liters)
Remember to substitute the calculated values from the previous steps into the equations to find the final molality and normality values.
The following determines the M and N. If you really want molality repost but m = mols/kg solvent and probably you can do that yourself.
1.10 g/mL x 1000 mL x 0.15 x (1/98) = ?M
Technically one cannot determine the N without knowing the reaction; however, USUALLY, it is M*#H atoms. The reason for that is that one may have two different reactions for H2SO4.
H2SO4 x NaOH ==> NaHSO4 + H2O in which case the N = molar mass/1 or
H2SO4 x 2NaOH ==> Na2SO4 + 2H2O in which case the N = molar mass H2SO4/2