s-Block ElementsHard
Question
Potassium carbonate is not prepared by :
Options
A.Solvay process
B.Le-Blanc process
C.Prechts process
D.none of these.
Solution
(A) KHCO3 obtained as intermediate is water soluble. So it cannot be separated for obtaing K2CO3 by calcination in Solvay process.
(B) Le-Blanc process :
KCl + H2SO4 → KHSO4 + HCl ; KHSO4 + KCl → K2SO4 + HCl
K2SO4 + CaCO3 + 2C → K2CO3 + CaS + 2CO2
(C) Prechts process :
(a) 2KCl + 3(MgCO3. 3H2O) + CO2 → 2(Mg CO3. KHCO3. 4H2O) + MgCl2
(b) 2(MgCO3. KHCO3. 4H2O)
2Mg CO3 ↓ + K2CO3 + 9H2O + CO2.
(B) Le-Blanc process :
KCl + H2SO4 → KHSO4 + HCl ; KHSO4 + KCl → K2SO4 + HCl
K2SO4 + CaCO3 + 2C → K2CO3 + CaS + 2CO2
(C) Prechts process :
(a) 2KCl + 3(MgCO3. 3H2O) + CO2 → 2(Mg CO3. KHCO3. 4H2O) + MgCl2
(b) 2(MgCO3. KHCO3. 4H2O)
2Mg CO3 ↓ + K2CO3 + 9H2O + CO2. Create a free account to view solution
View Solution FreeMore s-Block Elements Questions
Washing soda on heating :...KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it...Na2CO3 reacts with SO2 in alkaline medium to form:...Which of the following has the highest melting point?...The set representing the correct order of first ionisation potential is :...