Question

A certain salt X , gives the following results. (i) Its aqueous solution is alkaline to litmus. (ii) It swells up to a glassy material Y on strong heating. (iii) When conc. H 2 SO 4 is added to a hot solution of X , white crystal of an acid Z separates out. Write equations for all the above reactions and identify X , Y and Z .

Answer 1

Borax exists in nature as a hydrated salt Formula Na₂B₄O₇.10H₂O
Na₂B₄O₇ + 7H₂O ------> 2NaOH + 4H₂BO₃
Strong Base weak Acid
X=Na₂B₄O₇.10H₂O

2Na₂B₄O₇.10H₂O --------> 4NaBO₂ + 4B₂O₃ + 10H₂O
Y=NaBO₂

Na₂B₄O₇ +H₂SO₄ +5H₂O -----> Na₂SO₄ + 4H₃BO₃
H₃BO₃-------> HBO₂ +H₂O

Z=HBO₂ 

Answer 2

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