1.

(a) Complete the following equations (i) nCHZ = CHZ —> .................(ii) CH 3—C002H + NaHCO3 —> ........ + ...... +. (b) What is the cause of hardness of water? Why soap do not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water ?

Answer»

this is acid base reaction here CH3COOH is acid and NaHCO3 is base hence salt form. i.e. CH3COOH+NaHCO3----> CH3COONa +H20 +CO2Explanation:Half of this is a double displacement reaction. The reaction TAKES place in two steps. Step 1 CH₃COOH(aq) + NaHCO₃(s) → CH₃COONa + H₂CO₃(aq) This is a double displacement reaction because the Na trades partners with the H of CH₃COOH. Step 2 The carbonic acid formed in Step 1 DECOMPOSES into CO₂ and water. H₂CO₃(aq) → CO₂(g) + H₂O(l) This is a decomposition reaction, because one substance is converted into two different substances. OVERALL Reaction If you ADD the two equations together, the H₂CO₃ cancels out, and you get CH₃COOH(aq) + Na₂CO₃(s) → CH₃COONa(aq) + CO₂(g) + H₂O(l)



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