If 20.0 mL Ca(OH)2 with an unknown concentration is neutralized by 37.5 mL of 0.124 M HCl, what is the concentration of Ca(OH)2 solution?
回答 (1)
2017-10-18 9:31 am
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Mole ratio Ca(OH)₂ : HCl = 1 : 2
No. of moles of HCl reacted = (0.124 mol/L) × (37.5/1000 mL) = 0.00465 mol
No. of moles of Ca(OH)₂ reacted = (0.00465 mol) × (1/2) = 0.002325 mol
Molarity of Ca(OH)₂ = (0.002325 mol) / (20.0/1000 L) = 0.116 M
Mole ratio Ca(OH)₂ : HCl = 1 : 2
No. of moles of HCl reacted = (0.124 mol/L) × (37.5/1000 mL) = 0.00465 mol
No. of moles of Ca(OH)₂ reacted = (0.00465 mol) × (1/2) = 0.002325 mol
Molarity of Ca(OH)₂ = (0.002325 mol) / (20.0/1000 L) = 0.116 M
收錄日期: 2021-04-18 17:52:52
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