2. What cation reagent you will first use to test the known anion solutions? Wha

Question

2. What cation reagent you will first use to test the known anion solutions? What do you need to observe

carefully?

3.List the reagents you will use in order to learn more about differences in chemistry of silver chloride and silver iodide.

4.To confirm the presence of nitrate ion, you will be performing a so-called brown ring test. Describe briefly how you will do the test (show at least three steps)

Table 1 The Solubilities of Six Salts of Six Anions SO2 CO2 NO PO 12.1g 35.8g 179g 86.9g Na+ 19.0g white white white white white white 31.6g 98.5g 144 34.2 11.1g l 11g white white white white white white Mg2+ 33.7g 4 x 10-8 2 x 10-6 54.6g 58.3g 70.4g white white white white white white Ca T 2 x 10 5 x 10 3 x 10 74.5g 209g 129g white white white white Ba 1 x 10-10T 5 insoluble 36g white white 205g white white white white white white Ag 2x 10- 8 x 10-12 3 x 10-1 2 x 10-10 8x 10-12 218g white yellow yellow white pale yellow white

Explanation / Answer

Note that for "solubility" test, we need very insoluble species

so..

ignore all 10^-x salts, and assume

solbuility higher than 1

so

Na+, K+ are mostly soluble (alkali metals)

They will NOT be used to identify presence of anions, since they will NOT precipitate

2

Firt reagent should be the LEAST soluble, therefore, use always Ag+

Take careful consideration in pretty small precipitates

3

AgCl vs. AgI

Definetively identify the COLORS of precipitate, also the SIZE and MASS of the halogen will be important, as halogen gets heavier, then expect lower solubility

Q4

Step1: add iron(II) sulfate to a solution

Step2: addoncentrated sulfuric acid

Step3: Wait for an acid forms a layer below the aqueous solution

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