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Potassium hydrogen phthalate is a primary standard used to measure the concentration of
Chapter 2, Problem 2-10(choose chapter or problem)
Potassium hydrogen phthalate is a primary standard used to measure the concentration of NaOH solutions. Find the true mass of potassium hydrogen phthalate (density 1.636 g/mL) if the mass weighed in air is 4.236 6 g. If you did not correct the mass for buoyancy, would the calculated molarity of NaOH be too high or too low? By what percentage?
Questions & Answers
QUESTION:
Potassium hydrogen phthalate is a primary standard used to measure the concentration of NaOH solutions. Find the true mass of potassium hydrogen phthalate (density 1.636 g/mL) if the mass weighed in air is 4.236 6 g. If you did not correct the mass for buoyancy, would the calculated molarity of NaOH be too high or too low? By what percentage?
ANSWER:Step 1 of 3
Buoyancy corrections are corrections applied to mass measurements via calculating the difference in densities between the standard and unknown weight.
In this task we will use the formula for buoyancy correction given below, where stands for the density of air, whereas stands for the density of weighed product in air: