7 Crystal shape of third batch 8. Identity of third batch of crystals QUESTIONS

Question

7 Crystal shape of third batch 8. Identity of third batch of crystals QUESTIONS 1. Which of the following reactions are metathesis reactions? (a) 2Kao- 2KCI +302 (b) Cu(NOs)h+2n Cu+Zn(NO,h (c) Bacos + 2 HCI . BaCl2 + H2O +CO2 (d) Nazco, + Cuso,-. Na2SO. + Cuco, low many grams of each of the 2. H following substances will dissolve in 100 mL of cold water? Consult a handbook, or the Internet and cite your source. you have a solution that might contain any or all of the following cations: Cu2, Ag, Ba2, and Mn. Addition of HCl causes a precipitate to form. After the precipitate is filtered off, H SO4 is added to the supernate and another precipitate forms. This precipitate is filtered off, and a solution of NaOH is added to the supernatant liquid until it is strongly aikaline. No precipitate is formed. Which ions are pre- sent in each of the precipitates? Which cations are not present in the original solution? 4. Write balanced net ionic equations for the reactions, if any, that occur between (a) FeS(s) and HBr(aq) (b) K COs(a) and CuClyag): (c)Fe(NOs)h(aq) and HCI(aq); (d) Bi(OH)s(s) and HNOs(aq)

Explanation / Answer

question no 1

(C) and (D) are metathesis reactions. In general reactions of carbonates and bicarbonate with HCL is an example of metathesis reaction. So reaction (c) is an example of metathesis reaction.reaction d is an example of double displacement reaction. Ions are exchanged .double displacement reaction which forms a precipitate comes under metathesis reaction .

Question no 2

lead nitrate is soluble in water .solubility of lead nitrate per litre is 376.5 g. So solubility per 100 ml at zero degree Celsius is .3765 g.

Ammonium sulphate solubility per 100ml is 70.6 g.

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