(16) A fluoride disposal plant was constructed to carry out the following reactions F2 + 2NaOH → ½ O2 + 2NaF + H2O2NaF + CaO + H2O → CaF2 + 2NaOHAs the plant operated, enough lime was added from time to time to just bring out the complete precipitation of fluorine as CaF2. Over a period of time 2000 kg of fluorine was fed into the plant and 6000 kg of lime was added. What was the percentage utilization of lime?

(16) A fluoride disposal plant was constructed to carry out the follow

1.	(16) A fluoride disposal plant was constructed to carry out the following reactions F2 + 2NaOH → ½ O2 + 2NaF + H2O2NaF + CaO + H2O → CaF2 + 2NaOHAs the plant operated, enough lime was added from time to time to just bring out the complete precipitation of fluorine as CaF2. Over a period of time 2000 kg of fluorine was fed into the plant and 6000 kg of lime was added. What was the percentage utilization of lime?
Answer» (0028)No of moles of LIME required = 5610000×10 3 (m) out of CaO=56=1.286×10 5 No. of moles of F 2 fed = 191900×10 3 =105 moles2F 2 +4 NaOH→4NaF+2H 2 O+O 2 −−−(1)According to given reaction, moles FORMED of NaF only its half used in second reaction of below 2NaF+CaO+H 2 O→CaF 2 +NaOH22×10 5 =10521 ×10 5 =0.5×10 5 % utilisation of lime = no. of mole of lime requiredNo of mole of lime UTILISED = 1.786×10 5 0.5×10 5 ×100=28%answer =(0.028)