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Ca(OH)2+2HNO3--> Ca(NO3)2+H2O
MCa(OH)2=40g+32g+2g=74g/mol
MHNO3=48g+14g+1g=63g/mol
1mol Ca(OH)2---2moleHNO3
74g---2*63g
x---20g
x=11,74g
ODp. Trzeba dodać więcej jak 11,74g Ca(OH)2