The characteristics of a certain gas are listed in the table.
Characteristics of a Gas
Characteristic Description
Compound
Oxygen gas
Condition
STP
Mass
4.8 grams
What is the expected density of the above sample of gas?
O 1.90 g/L
O 1.82 g/L
O 1.56 g/L
O 1.43 g/L

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.