Stock solutions: A : 0.2 M NaH 2 PO 4 or 0.2 M KH 2 PO 4 (This solution is acidi
ID: 785031 • Letter: S
Question
Stock solutions:
A: 0.2 M NaH2PO4 or 0.2 M KH2PO4 (This solution is acidic)
B: 0.2 M Na2HPO4 or 0.2 M K2HPO4 (This solution is basic)
A (ml)
B (ml)
Final pH
92.0
8.0
5.8
87.7
12.3
6.0
81.5
18.5
6.2
68.5
31.5
6.5
62.5
37.5
6.6
56.5
43.5
6.7
51.0
49.0
6.8
45.0
55.0
6.9
39.0
61.0
7.0
33.0
67.0
7.1
28.0
72.0
7.2
23.0
77.0
7.3
19.0
81.0
7.4
16.0
84.0
7.5
8.5
91.5
7.8
5.3
94.7
8.0
How do you make 2 liters of 500 mM NaPO4, pH 7.8 (FW of NaH2PO4 = 120; FW of Na2HPO4 = 142)?
A (ml)
B (ml)
Final pH
92.0
8.0
5.8
87.7
12.3
6.0
81.5
18.5
6.2
68.5
31.5
6.5
62.5
37.5
6.6
56.5
43.5
6.7
51.0
49.0
6.8
45.0
55.0
6.9
39.0
61.0
7.0
33.0
67.0
7.1
28.0
72.0
7.2
23.0
77.0
7.3
19.0
81.0
7.4
16.0
84.0
7.5
8.5
91.5
7.8
5.3
94.7
8.0
Stock solutions: 0.2 M NaH2PO4 or 0.2 M KH2PO4 (This solution is acidic) 0.2 M Na2HPO4 or 0.2 M K2HPO4 (This solution is basic) How do you make 2 liters of 500 mM NaPO4, pH 7.8 (FW of NaH2PO4 = 120; FW of Na2HPO4 = 142)?Explanation / Answer
Did not get it