32 Qualitative Analysis Part A 8. Paint is generally 25% pigment, with the rest

Question

32 Qualitative Analysis Part A 8. Paint is generally 25% pigment, with the rest being solvent, resin, and other additives. If you determine that 45% of the pigment in a mixed white paint is lead(I) what mass of lead(TI) carbonate is there in an 80 g tube of paint? 9. A good qualitative test for titanium(IV) oxide is that when the compound reacts with hydrogen peroxide and sulfuric acid, the solution tums orange-red. What information would you need to know to use this test to determine how much titanium(IV) oxide is in a paint with this pigment? What instrument would you need? 10. The currently preferred method of identifying cations in paint is a handheld X-ray fluorescence (XRF) analyzer that uses a beam oflight to evaluate the surface of a painting. Explain why this method might be better for paintings than the type of tests done in lab.

Explanation / Answer

Q.8: Given the mass of paint = 80 g

=> mass of pigment in the paint = 80 g x (25/100) = 20 g

Given in the question that 45% of the pigment is lead(II) carbonate.

Hence mass of lead(II) carbonate in the paint = 20 g x (45/100) = 9 g (answer)

Hence mass of lead(II) carbonate in 80 g of tube paint is 9 g

Q.9: We need the following apparatus:

Reduction apparatus containing a stoppered 500 mL Erlenmeyer flask with a U shaped 5 mm delievery tube leading to a 250 mL beaker. Zirconiu crucible(30 mL), Vycor beaker(250 mL), Ashing equipment (a silica, dish and a muffle furance)

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