21. Atomic theory timeline: Use the names of atomic theories in the word tank to complete the time line about atomic theory. Put the letter in the bank under the year it goes with
A Thomson's Model 3. Modem Model of an Atom C. Dolton's Model 0. Bo's Modes
E. Rutherford's Moctel
1. Democntus
6. Cloud Model
1
1913
1913
1920
1932
430 BCE
1897
1800

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.