3. Note the number of tablets used until the colour of the solution changed and calculate
the result from the formula below appropriate to the sample volume taken:
Sample volume 50 ml:
Total Alkalinity (mg/l CaCO
Sample volume 100 ml:
Total Alkalinity (mg/l CaCO
Conversion Table
1 mg/l
CaCO
3
*
Hydrogen carbonate hardness
Example
250 mg/l CaCO
3
Cleaning
Thoroughly rinse out the sample container and the stopper after each use.
) = (No. of Tablets x 40) - 20
3
) = (No. of Tablets x 20) - 10
3
mmol/l
0,02
x 0,07 = 17,50 °e
°dH
*
as KH
0,056
°e
°f
*
0,07
0,10
*