Reference no: EM131058228
Can someone help please.
Further analysis and quantitative chemistry
A school chemistry technician was tidying up in the outside chemical store. Four bottles of chemicals were found where the labels were unclear. The technician thought they were potassium carbonate, potassium chloride, potassium sulfate and aluminium sulfate.
The following reagents were readily available:
barium chloride solution acidified with dilute hydrochloric acid
dilute hydrochloric acid
silver nitrate solution acidified with dilute nitric acid
sodium hydroxide solution.
The technician made up aqueous solutions of the unknown compounds and did some tests to confirm their identity.
Describe the tests you would do to show that these chemicals are correctly named.
In each case give the reagent(s) you would use and then what you would see.
(a) The test and result for potassium ions.
(b) The test and result for aluminium ions.
(c) The test and result for carbonate ions.
(d) The test and result for chloride ions.
(e) The test and result for sulfate ions.
(f) How would a flame test distinguish the aluminium compound from the others?
The technician also found a large flask of hydrochloric acid, but the concentration label had disintegrated.
25.0 cm3 of the hydrochloric acid were titrated against 0.4 mol/dm3 sodium hydroxide solution. The average volume of hydroxide used was 24.0 cm3.
(g) Describe how the titration would be carried out.
(h) Complete the equation for this reaction.
NaOH + HCl → ________ + ________
(i) Calculate the concentration in moles per cubic decimetre of the hydrochloric acid.
1 mole of sodium hydroxide reacts completely with 1 mole of hydrochloric acid.
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Further analysis and quantitative chemistry
: A school chemistry technician was tidying up in the outside chemical store. Four bottles of chemicals were found where the labels were unclear. The technician thought they were potassium carbonate, potassium chloride, potassium sulfate and alumini..
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