thanks everyone for your time and help I\'m really grateful. these are my last q

Question

thanks everyone for your time and help I'm really grateful. these are my last questions.

tERLAENYIUrontinuedl NAME QUESTIONS AND PIOBI easi are alt ealculartona. Anauer rith pruper ninnler of eigninnant ngurer u siunifinanz ngurer u und uatb finer ati the gretions in completed wateriak, What, Rea What, wndonsa m 1 he capentivr 110 ainke sury, inst all ne2GaHcoa w.re JFTl rOdU pr Theoretically, why should the moles oiNatiCO:MTeS Gre mules otNdMprm! tne same? why is the mass of NaC1recovered leas inan the stering Tuan ltre mase, o

Explanation / Answer

1. NaHCO3 reacts with HCl giving NaCl and H2CO3. H2CO3 decomposes to CO2 and water. So CO2 gas evolves from the solution with effervescence. Hence addition of HCl till the evolution of gas stops makes sure that all the NaHCO3 is reacted.

2. The balanced equation for the reaction is:

NaHCO3 + HCl -----> NaCl + H2CO3

So one mole of NaHCO3 gives one mole of NaCl.

Hence, theoretically, moles of NaHCO3 should equal the moles of NaCl produced

3. Mass of NaCl = moles * molar mass

Molar mass of NaCl is less than molar mass of NaHCO3. So mass of NaCl recovered is less than starting mass of NaHCO3. It is only moles which are equal.

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