Testing                                                                                                                                                    pH VALUE

pH VALUE

General 

The following method is suitable for the regular run of commercial and industrial papers, the water, extracts of which are normally acidic and usually buffered. It is not adequate for determining the pH of unbuffered and neutral papers, such as insulating papers, which require a more accurate method for eliminating error due to the absorption of carbon dioxide by the water extract during its preparation and testing.

Apparatus

 The following apparatus is required.

Electrometric pH Meter-Any standard pH meter. Calibrate against standard buffer solutions at two pH values.

Reagents

The following reagents are required.

Buffer Solutions -Two standard solutions, one with pH 4 and the other with pH9.

Distilled Water - pH 6. 0 to 7. 2

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