Tehtävät

Teksti

$V\left(NaOH\right)\approx8{,}3\ ml=8{,}3\cdot10^{-3}l$

$n\left(NaOH\right)=8{,}3\cdot10^{-3}l\cdot0{,}10\ \frac{mol}{l}=8{,}3\cdot10^{-4}mol$

$C_6H_5COOH\left(s\right)+NaOH\left(aq\right)\rightarrow C_6H_5COONa\left(aq\right)+H_2O\left(l\right)$

$n\left(C_6H_5COOH\right)=n\left(NaOH\right)=0{,}10\ \frac{mol}{l}\cdot8{,}3\cdot10^{-3}\ \frac{mol}{l}=8{,}3\cdot10^{-4}mol$

Punnitti määrä

$m\left(C_6H_5COOH\right)=100mg=0{,}100g$

$n=\frac{m}{M}\ \xrightleftharpoons[]{}\ M=\frac{m}{n}=\frac{0{,}100g}{8{,}3\cdot10^{-4}mol}\approx120{,}48\ \frac{g}{mol}$

$M\left(C_6H_5COOH\right)=\left(7\cdot12{,}01+6\cdot1{,}001+2\cdot16{,}00\right)\ \frac{g}{mol}=122{,}118\ \frac{g}{mol}$