0 1.99
1.0 2.04
2.0 2.12
3.0 2.21
4.0 2.34
5.0 2.50
6.0 2.76
7.0 3.32
8.0 4.93
8.5 5.26
9.0 5.48
9.5 5.61
10.0 5.75
10.5 5.88
11.0 5.98
11.5 6.10
12.0 6.21
12.5 6.34
13.0 6.48
13.5 6.64
14.0 6.85
14.5 7.17
15.0 8.75
#15.5 8.94
16.0 10.55
16.5 10.93
17.0 11.15
17.5 11.26
18.0 11.45
20.0 11.64
22.0 11.75
24.0 11.83
25.0 11.87

glgw. 7.5/15 ml (2 Protonen)
pKs1=2.3 (3.75 ml)
pKs2=6.0 (10.375 ml)
875 mg/0.0015/2 mol = 116 g/mol -> Malonsaeure (Buten-cis-disaeure)

"untergehende Sonne"

5 Erlenmeyerkolben, Na-thiosulfatloesung 0.1M, H2O, HCl 2M

No  Na2S2O3 H2O HCl  Zeit (s bis zur vollstaendigen Truebung)
1   50 ml   --  5 ml 28
2   40      10  5    (420?)
3   30      20  5    59
4   20      30  5
5   10      40  5    316