If 10.0 mL of .985 M NaOH adds to 25.0 mL of .990 M HY (unknownacid), the pH solution is 4.51. The concentration of HX and NaOHbefore mixing is .990 M and .985 M. What is the concentration of unreacted HX and X- after reaction? How do you find the equilibrium concentration of HX, X-, and H3O+ by using the ICE box with the chemical equation?