Challenge Yourself

How's learning Analytical Chemistry so far? Are you happy or not? Answer YES or NO only

(a)  

The particle size or precipitates can be controlled during gravimetric analysis. How to minimize the relative super saturation phenomenon?

• The value of S must be low

• Q-S must be high

• Q-S must be low

• The value of Q must be high

Which are the methods to minimize the adsorbed impurities on precipitate surfaces? (Tick all the possible answers)

• Reprecipitation

• Washing

• Burning

• Digestion

The precipitate formed when barium chloride is treated with sulfuric acid is (a)   ? answer with molecular name and all small letters

Name the process that contaminates the precipitates and also carries the precipitate solution containing soluble impurities.

• Supersaturation

• Reprecipitation

• Coprecipitation

• None of the above

Analyse the statements and select the correct option.

Statement I: The precipitate must have high solubility in order to be easily separated from the reaction mixture.

Statement II: Large-particle precipitates are frequently preferred for gravimetric analysis.

• Both statements are incorrect

• Only statement II is correct

• Both statements are correct

• Only statement I is correct

Larger-sized particles are required for gravimetric analysis because they are easily filtered and washed clean of impurities. True or false?

• True

• False

Which of the following IS NOT critical for the gravimetry analysis?

• Reading the burette to 2 decimal places after adding the precipitating reagent

• Addition of extra precipitating reagent

• Thorough washing of the precipitate.

• Accurately weigh the filter paper before filtering the precipitate

If ___________ process predominates, a precipitate containing a large number of small particles results. These small particles are called as ____________. (write in all small letter with comma and no space)

(a)