This question is about citric acid, a hydrated tricarboxylic acid. Its formula can be represented as H3Y⋅xH2OH_3Y \cdot xH_2OH3Y⋅xH2O.
A 4.20 g4.20\text{ g}4.20 g sample of H3Y⋅xH2OH_3Y \cdot xH_2OH3Y⋅xH2O contains 2.56 g2.56\text{ g}2.56 g of oxygen by mass. The sample burns completely in air to form 5.28 g5.28\text{ g}5.28 g of CO2\text{CO}_2CO2 and 1.80 g1.80\text{ g}1.80 g of H2O\text{H}_2\text{O}H2O. Show that the empirical formula of the hydrated citric acid is C3H5O4\text{C}_3\text{H}_5\text{O}_4C3H5O4.
A 10.50 g10.50\text{ g}10.50 g sample of H3Y⋅xH2OH_3Y \cdot xH_2OH3Y⋅xH2O (Mr=210.0M_{\text{r}} = 210.0Mr=210.0) is heated to constant mass. The anhydrous H3YH_3YH3Y that remains has a mass of 9.60 g9.60\text{ g}9.60 g. Show, using these data, that the value of x=1x = 1x=1.
Figure 5 shows the structure of H3YH_3YH3Y:
Complete this IUPAC name for H3YH_3YH3Y:
____________________ propane-1,2,3-tricarboxylic acid\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ propane-1,2,3-tricarboxylic acid}____________________ propane-1,2,3-tricarboxylic acid
State the number of peaks you would expect in the 13C NMR{}^{13}\text{C}\text{ NMR}13C NMR spectrum for H3YH_3YH3Y.