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NaOH---HCl-->NaCl
Na2CO3--HCl-->NaHCO3 +NaCl
n(NaOH)+n(Na2CO3)=0.2450mol/L*29.30mL=7.179mol
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NaHCO3 +NaCl--HCl-->2NaCl
n(Na2CO3)=n(NaHCO3)=0.2450mol/L *0.30mL
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n(Na2CO3)=n(NaHCO3)=0.2450mol/L *0.30mL=0.074mmol
n(NaOH)=7.105mmol
è¯ç¨NaOHçå«é=(7.105*10^-3 mol *40.01g/mol)/0.2875g*100%=98.88%
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