3). A 50.0 g sample of silver is heated to 1230C . It is placed in a cool water bath. The water has original temperature 20.00C. Eventually both the silver and the water end up at 23.00C. (Specific heats for silver and water are 0.24 J/g C and 4.184 J/g C, respectively) Determine the following:
a). the amount of heat released by the metal b). the mass of water used in the experiment

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.