First slide

Alkaline earth metals

Question

$\begin{array}{l} A \overset{Δ}{⟶} B (oxide) + {CO}_{2} \\ B + H_{2} O ⟶ C \\ C + {CO}_{2} ⟶ A (milky) \\ C + {NH}_{4} Cl \overset{Δ}{⟶} D (gas) \\ D + H_{2} O + {CO}_{2} ⟶ E \\ E + NaCl ⟶ F \\ F \overset{Δ}{⟶} {Na}_{2} {CO}_{3} + {CO}_{2} + H_{2} O \end{array}$
B and C are:

Moderate

A

$C a O, C a {(O H)}_{2}$
B

$C a {(O H)}_{2}, C a C O_{3}$
C

$C a C O_{3}, C a {(O H)}_{2}$
D

$C a {(O H)}_{2}, C a O$

Solution

$\underset{(A)}{C a C O_{3}} \overset{Δ}{\to} \underset{(B)}{C a O} + C O_{2} \underset{(B)}{C a O} + H_{2} O \overset{}{\to} \underset{(C)}{C a {(O H)}_{2}} \underset{(C)}{C a {(O H)}_{2}} + C O_{2} \overset{}{\to} \underset{(A)}{C a C O_{3}} \underset{(C)}{C a {(O H)}_{2}} + N H_{4} C l \overset{Δ}{\to} \underset{(D)}{N H_{3}} \underset{(D)}{N H_{3}} + H_{2} O + C O_{2} \overset{}{\to} \underset{(E)}{N H_{4} H C O_{3}} \underset{(E)}{N H_{4} H C O_{3}} + N a C l \overset{}{\to} \underset{(F)}{N a H C O_{3}} \underset{(F)}{N a H C O_{3}} \overset{Δ}{\to} N a_{2} C O_{3} + C O_{2} + H_{2} O$

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