Find the percent acid (eq wt 173.8) if 20.07ml of 0.1100 N base is required to neutralize 0.721g sample
To find the percent acid in the sample, we first need to calculate the number of moles of the base used to neutralize the acid.
Step 1: Calculate the number of moles of the base used.
To do this, we use the formula:
Number of moles = concentration (in moles per liter) x volume (in liters)
Given:
Concentration of the base = 0.1100 N
Volume of the base used = 20.07 ml = 0.02007 L
Number of moles of the base = (0.1100 N) x (0.02007 L)
= 0.0022117 moles
Step 2: Calculate the number of moles of the acid.
To do this, we can use the equation:
Number of moles = mass (in grams) / molar mass (in grams per mole)
Given:
Mass of the sample = 0.721 g
Molar mass of the acid = 173.8 g/mol
Number of moles of the acid = (0.721 g) / (173.8 g/mol)
= 0.0041504 moles
Step 3: Calculate the percent acid in the sample.
To find the percent, we use the equation:
Percent acid = (number of moles of the acid / number of moles of the sample) x 100%
Number of moles of the sample = Number of moles of the acid
Percent acid = (0.0041504 moles / 0.0022117 moles) x 100%
≈ 187.35%
Therefore, the percent acid in the 0.721g sample is approximately 187.35%.