1· The Group l cations Ag-reacts with an aqueous chionde solution to produce an

Question

1· The Group l cations Ag-reacts with an aqueous chionde solution to produce an nsohble sait which is not soute r, an acd wine the formula of the insouble sait. When the Sait is treated with ammonia,a assolves and orms a compex what complex? the tonna ot the 2. During the analysis of the Group II cations, you converted arsenic sulfide to an arsenate anion which was finally precipitated as magnesium ammonium arsenale, MgNHaAsO What is the oxidation number of Mg? 3. During the analysis of the Group il cations, you treated Fe(OH)s precipitate with HCI. Winite a balanced equation for this reaction. 4. During the anion analysis, you treated a nitrate solution with concentrated H SO4 and an aqueous sollution of FeSOs in arder to observe a brown ring. What is the formula of the brown ring? 5. A salt is dissolved completely in water to form a blue solution. What possible cation/s) and anion(s) could be present? 6. A solution, which was made by dissoving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a treezing point of -1.88 C. What is the molecular weight of this nonelectrolyte compound? For water. Kis 186 ml and K. is 0.51 mt 7. When a Cu solution is treated with concentrated NHs, it changes its color from pale blue to deep blue. When a few drops of HNOs is added to the deep blue solution, it changes its color. Explain the reactions with proper equations 8. A 0.25g sample of an unknown manoprotic acid was trated with 25 00 ml of 0.1025M NCH soluton Calculate the gram molecular weight (molar mass) of the unknown acid 9. 20.0 mL of 0.10 M H:SO4(aq) was added to 50.0 ml of 0.10 M NaOH(ag) and the mbcture was stirred, then tested with a pH meter What is its pH at 25.0 ? 1.85 a. b. C. d 11.00 e 12.15 7.00 0. How test Co* in the presence of Fe ?

Explanation / Answer

1. AgCl (insoluble) and other complex is Ag(NH3)2Cl

3. Fe(OH)3 + 3HCl = FeCl3 + 3H2O

4. [Fe(H2O)5(NO)]SO4 [brown ring]

5. it is salt of cupper and possibly it is CuSO4, so the cation is cupper ion and anion is sulphate ion

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