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

Paint is 25 % of pigment (say P)

P pigment can be a mixture of two or more than two compounds one of which is given Lead (II)Carbonate

Lead Carbonate is 45 % of pigment P

lEAD Carbonate is 45 % of P

We will first find % of Lead Carbonate in paint

That would be 45% of 25 %

=45/100 * 25 /100

=11.25 %

That means Lead Carbonate is 11.25 % of total paint .

Now we have given 80 g tube of paint and asked amount of Lead carbonate in it

So we will find it by taking 11.25 % of 80 g

=11.25 /100 *80

=900/100

=9 grams of Lead Carbonate in 80g paint.

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