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Chapter 27: Q8P (page 767)

Explain what is done in thermogravimetric analysis.

Short Answer

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Thermogravimetric analysis is used for the measurement of thermal stability of materials including polymers.

Step by step solution

01

Define Thermogravimetric analysis:

Thermogravimetric analysis (TGA) is a powerful technique for the measurement of thermal stability of materials including polymers. In this method, changes in the weight of a specimen are measured while its temperature is increased. Moisture and volatile contents of a sample can be measured by TGA.

Thermogravimetric analysis (TGA) is a method for thermal analysis and following steps are:

when sample is being heated the mass of sample is measured
mass being lost during this process provides information about the composition of the sample

For example, if we have a mixture of different compounds with different known volatilities, we can use that information in order to determine at which point is some compound lost + which compound is actually lost.

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Most popular questions from this chapter

A 0.050 02-g sample of impure piperazine contained 71.29 wt% piperazine (FM 86.136). How many grams of product (FM 206.240) will be formed when this sample is analyzed by Reaction 27-6?

If reproducibility is $\pm 0.5 mg$ , product mass might have been0.1339to 0.1349 g. Find wt\% $Al (C_{9} H_{6} NO)_{3}$ if the product weighed 0.1339 g.

An alloy contains $~ 2.0$ wt% Ni. What volume of 0.83 wt% DMG should be used to provide a 50%excess of DMG for the analysis of 1.8 g of steel? What mass of $Ni (DMG)_{2}$ precipitate is expected?

${LaCoO}_{3 + x}$ , has a perovskite structure (Box 19-1) with variable oxygen content. The figure shows the thermogravimetric curve observed when 41.8724m gwere heated in role="math" localid="1665035505591" $5 vol % H_{2} in Ar . La (II)$ does not react, but cobalt is reduced to Co(s)

(a) What is the oxidation state of cobalt in the ideal formula ${LaCoO}_{3}$

(b) Write the reaction of role="math" localid="1665035588740" ${LaCoO}_{3} with H_{2}$ to produce ${La}_{2} O_{3} with (s), Co (s), and H_{2} O (s)$

(c) If $41.8724 mg of {LaCoO}_{3}$ react completely, what will be the mass of product $({La}_{2} O_{3} + (Co)$ ?

(d) Write the balanced reaction of role="math" localid="1665035782894" ${LaCoO}_{3 + x} with H_{2} O$ to produce ${La}_{2} O_{3}, Co, and H_{2} O . If 41.8724 mg of {LaCoO}_{3 + 1}$ react completely; what will be the mass of solid product? Your answer will be an expression with x in it.

(e) From the observed product mass $(37.767 mg) at 700 ° c$ , find x in ${LaCoO}_{3 + x}$ Write the formula of the starting solid.

(f) In part (c), the mass lost from the ideal formula ${LaCoO}_{3 + x}$ , is 4.0877 mg. What is the product nearrole="math" localid="1665035980286" $500 ° C$ where the mass is -40.51 mg?

Write a balanced equation for the combustion of benzoic acid, $C_{6} H_{5} {CO}_{2} H$ , to give ${CO}_{2}$ and $H_{2} O$ . How many milligrams of and of will be produced by the combustion of 4.635mgof benzoic acid?

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