ICS 71.060.30                         CHD 1

(Superseding IS 3225 : 1965 and lS 5741 : 1970)

Reaffirmed 2022

1. Scope

1.1 This standard prescribes the methods for preparation of buffer solutions used in analytical and control laboratories in industry and the methods for determination ofpH by calorimetric and electrometric methods.

1.1.1 Primary and secondary standard buffer solutions for calibration ofpH meters are also included in this standard.

1.1.2 This standard covers general methods of pH determination by calorimetric and glass-electrode direct-reading pH under electrometry.

2. Referenced Documents

The following standards contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

IS No. Title

695:1986 Specification for acetic acid (third revision)

1070:1992 Reagent grade water (third revision)

2124:2000 Sodium bicarbonate - Specification (second revision)

2711: 1979 Direct reading pH meters (second revision)