Blog

Which statement(s) is/are true regarding precipitate particle size?Particle size must be large enough to not clog or pass through a filter.Particle size is controlled by precipitation conditions.Thermodynamics favors larger crystals because the surface atoms have higher energy than internal atoms, and the fraction of atoms on the surface is smaller for larger crystals than smaller crystals.Ostwald ripening is the process via which smaller particles redissolve and larger crystals grow.

Calculate the pH of a 0.150 M maleic acid solution. pK1 = 1.92 and pK2 = 6.27 for maleic acid.

A 50.00-mL aliquot of 0.100 M HNO3 is titrated with 0.075 0 M NaOH. Calculate the pH after 40.00 mL of 0.075 0 M NaOH has been added.

The end point for the Volhard titration is indicated by

Calculate the pH of 0.005 0 M HF. The Ka for HF is 6.8 × 10−4.

Calculate the pH of a 0.200 M H2A− solution. K1 = 1.00 × 10−4, K2 = 1.00 × 10−8 and K3 = 1.00 × 10−12.

Determine the value of K for the reaction formed when the two given reactions are added together. CO2(aq) + H2O(l) ⇌ (aq) + H+(aq) K1 = 4.5 × 10−7 (aq) ⇌ H+(aq) + (aq) K2 = 4.7 × 10−11 _________________________________________________________________________________________________ CO2(aq) + H2O(l) ⇌ 2H+(aq) + (aq) K3 = ?

Calculate pPb2+ at the equivalence point when 25.00 mL of 0.120 M  is titrated with 0.120 M Pb2+. Ksp = 7.4 × 10−14 for PbCO3.

You need to prepare 1.00 L of a pH 5.00 propionic acid buffer with a total concentration of 50 mM. Calculate the millimoles of propionic acid and sodium propionate needed to prepare the buffer. Ka = 1.34 × 10−5 for propionic acid. Hint: Set millimoles of propionate equal to x and millimoles of propionic acid equal to 50 − x. Insert into the Henderson-Hasselbalch equation and solve for x. X mmol sodium propionate; Y mmol propionic acid (Report 1 decimal place) Answer setup:  X; Y

For the following set of replicate measurements calculate the : (Report to 2 decimal places) Average deviation [A], [B], [C], [D], [E], [F]