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[CH3COOH] : ...... mol/L ?
volume NaOH : 0,1 M
[NaOH] : 20 mL
jawab
M : mmol / mL
mmol : M x mL
Pada proses titrasi mmol CH3COOH sebanding dengan mmol NaOH sehingga berlaku persamaan berikut :
mmol CH3COOH : mmol NaOH
40 mL x M CH3CCOH : 0,1 mmol/mL x 20 mL
M CH3COOH : (0,1 mmol/mL x 20 mL) / 40 mL
CH3COOH : 0,05 mmol/mL
CH3COOH : 0,05 M
M : mmol / mL
M : (mg / Mr) / mL
M : mg / (Mr x mL)
mg : M x Mr x mL
Mr CH3COOH : 12(2) + 1(4) + 16(2)
Mr CH3COOH : 24 + 4 + 32
Mr CH3COOH : 60 mg/mmol
massa CH3COOH : 0,05 mmol/mL x 60 mg/mmol x 40 mL
massa CH3COOH : 120 mg x 10^-3 g/mg
massa CH3COOH : 0,1200 gram
Jadi, terdapat 0,120 gram CH3COOH yg bereaksi sempurna dengan NaOH 0,1 M
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