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Asumsikan :
a = koefisien CaCO₃
b = koefisien HCl
c = koefisien CaCl₂
d = koefisien H₂O
e = koefisien O₂
a CaCO₃ + b HCl → c CaCl₂ + d H₂O + e CO₂
Ca (Kalsium)
Ca dikiri = Ca dikanan
a = c
C (Karbon)
C dikiri = C dikanan
a = e
Cl (Klorida)
Cl dikiri = Cl dikanan
b = 2c
O (Oksigen)
O dikiri = O dikanan
3a = d + 2e
H (Hidrogen)
H dikiri = H dikanan
b = 2d
Subtitusikan, apabila misal a = 1
a = c = e = 1
b = 2c = 2(1) = 2
3a = d + 2e
d = 3a - 2e
d = 3(1) - 2(1)
d = 1
Jadi a = 1 , b = 2 , c = 1 , d = 1 , e = 1
CaCO₃ + 2 HCl → CaCl + H₂O + CO₂
Jadi reaksi yang terdapat di soal sudah setara