User:M1ss1ontomars2k4/sandbox1

$$0.23 \mbox{ g TRIS} \times {\mbox{mol TRIS} \over 121.136 \mbox{ g TRIS}} \times {\mbox{mol HCl} \over \mbox{mol TRIS}} \times {\mbox{L} \over 0.1 \mbox{ mol HCl}} \times {1000 \mbox{ mL} \over \mbox{L}} = 19 \mbox{ mL}$$ $$0.1959 \mbox{ g TRIS} \times {\mbox{mol TRIS} \over 121.136 \mbox{ g TRIS}} \times {\mbox{mol HCl} \over \mbox{mol TRIS}} \times {\mbox{L} \over 0.1 \mbox{ mol HCl}} \times {1000 \mbox{ mL} \over \mbox{L}} = 16.17 \mbox{ mL}$$ $$0.1803 \mbox{ g TRIS} \times {\mbox{mol TRIS} \over 121.136 \mbox{ g TRIS}} \times {\mbox{mol HCl} \over \mbox{mol TRIS}} \times {\mbox{L} \over 0.1 \mbox{ mol HCl}} \times {1000 \mbox{ mL} \over \mbox{L}} = 14.88 \mbox{ mL}$$