A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?
To find the concentration (in molarity) of the KOH solution, we can use the following equation:
Molarity (M) = Number of moles (mol) / Volume (L)
First, we need to calculate the number of moles of KHP (potassium hydrogen phthalate). We can do this using the molar mass of KHP.
The molar mass of KHP (C8H5KO4) is:
- 1 atom of C: 12.01 g/mol
- 8 atoms of H: 1.01 g/mol
- 5 atoms of O: 16.00 g/mol
- 1 atom of K: 39.10 g/mol
Total molar mass of KHP = (12.01 × 8) + (1.01 × 5) + (16.00 × 4) + 39.10 = 204.22 g/mol
Now, we can calculate the number of moles of KHP using its mass:
Number of moles of KHP = Mass of KHP / Molar mass of KHP
= 0.4883 g / 204.22 g/mol
Next, we need to convert the volume of the KOH solution from milliliters (mL) to liters (L):
Volume of KOH solution (L) = 16.13 mL / 1000 mL/L
Finally, we can calculate the molarity (concentration) of the KOH solution:
Molarity (M) = Number of moles of KHP / Volume of KOH solution
Now, plugging in the values:
Molarity (M) = (0.4883 g / 204.22 g/mol) / (16.13 mL / 1000 mL/L)
Molarity (M) = (0.4883 g / 204.22 g/mol) / 0.01613 L
Molarity (M) ≈ 0.1179 mol/L
Therefore, the concentration (in molarity) of the KOH solution is approximately 0.1179 M.
To find the concentration (in molarity) of the KOH solution, we need to use the formula:
Molarity (M) = moles of solute / volume of solution (in liters)
First, let's find the moles of solute (KOH). We are given the mass of the solute KHP, which is 0.4883 g. To find moles, we need to use the molar mass of KHP, which we can find using the periodic table.
The molar mass of KHP (KHP is short for potassium hydrogen phthalate) is:
K (potassium) = 39.10 g/mol
H (hydrogen) = 1.01 g/mol
C8H5O4 (phthalate group) = 8(12.01 g/mol) + 5(1.01 g/mol) + 4(16.00 g/mol)
Molar mass of KHP = 204.23 g/mol
To find the moles of KHP, we can use the formula:
moles = mass / molar mass
moles of KHP = 0.4883 g / 204.23 g/mol
Now that we have the moles of KHP, we need to find the volume of the solution in liters. The given volume of the KOH solution is 16.13 mL, which we need to convert to liters.
volume (in liters) = 16.13 mL / 1000 mL/L
Now we have all the values we need to calculate the concentration (in molarity) of the KOH solution:
Molarity (M) = moles of solute / volume of solution (in liters)
Molarity (KOH) = moles of KHP / volume (in liters)