6g of impure NaOH was dissolved in 100ml of a solution.0.25molar solution of the base utilize 27.6ml of the solution containing 6g of trioxonitrate(5)acid.calculate (a)molar concentration of acid (b) molar concentration of base (c) mass of the base (d) % purity of the base
To calculate the molar concentration of the acid, base, the mass of the base, and the percentage purity of the base, we need to follow a step-by-step approach:
(a) Molar concentration of the acid:
To find the molar concentration of the acid, we need to calculate the number of moles present in the solution. In this case, the acid is trioxonitrate(5) acid.
Given:
Volume of solution = 27.6 mL
Molarity of the base = 0.25 M
We can use the formula:
Moles of solute = Molarity × Volume (in L)
Converting the volume to liters:
27.6 mL = 27.6/1000 L = 0.0276 L
Now, we can calculate the moles of the acid:
Moles of acid = 0.25 M × 0.0276 L
(b) Molar concentration of the base:
The molar concentration of the base is given as 0.25 M.
(c) Mass of the base:
To calculate the mass of the base, we need to determine the number of moles of the base present in the solution. Given that 6 g of impure NaOH was dissolved, we can assume all the impurities are NaOH, and the impure NaOH is the base.
The molar mass of NaOH is 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.00 g/mol.
We can use the formula:
Moles = Mass / Molar mass
Moles of base = 6 g / 39.00 g/mol
(d) Percentage purity of the base:
To find the percentage purity of the base, we need to compare the mass of the pure substance (NaOH) to the mass of the impure substance (NaOH + impurities).
The percentage purity can be calculated using the formula:
Percentage purity = (Mass of pure substance / Mass of impure substance) × 100%
Percentage purity = (6 g / Mass of impure substance) × 100%
Now that we have explained the steps involved, you can perform the calculations using the given values and formulas to determine the molar concentration of the acid, molar concentration of the base, mass of the base, and the percentage purity of the base.