Adapting A Buret Titration For Use With A Digital Titrator - Hach DR/700 Procedures Manual

Table 3 Calibration Table
%T
Tens 0
0
10 2.30 2.21 2.12 2.04 1.97 1.90 1.83 1.77 1.72 1.66
20 1.61 1.56 1.51 1.47 1.43 1.39 1.35 1.31 1.27 1.24
30 1.20 1.17 1.14 1.11 1.08 1.04 1.02
40 .92 .89
50 .69 .67
60 .51 .49
70 .36 .34
80 .22 .21
90 .11 .09

Adapting a Buret Titration for Use With a Digital Titrator

Adapt any standard titration procedure using a buret to the Digital
Titrator by using the following procedure.
1. Select a titration cartridge from Table 4 with the same active
ingredient as the buret solution.
2. Determine the approximate number of digits required. The Digital
Titrator dispenses 1 mL per 800 digits on the counter. Using the
following equation, determine the digits required for your buret method.
Digits Required =
Where:
N = Normality of buret Titration
t
mL = milliliters of buret titrant required for an average titration
t
N = Normality of Digital Titrator cartridge
c
3. If the number of digits required is within the range of 70 to 350, you
can use the procedure as written, substituting the Digital Titrator directly
for the buret. Or, if the number of digits is outside of this range, make
the following modifications.
a. If the number of digits required is more than 350, reduce the sample
size to save titrant.
%T UNITS
1 2 3
.87 .84 .82
.65 .64 .62
.48 .46 .45
.33 .32 .30
.20 .19 .17
.08 .07 .06
4 5 6
.80 .78
.60 .58
.43 .42
.29 .28
.16 .15
.05 .04
N x mL x 800
t t
N
c
1-14
7 8 9
.99 .97 .94
.77 .73 .71
.56 .55 .53
.40 .39 .37
.26 .25 .24
.14 .13 .12
.03 .02 .01