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*International Postage UNAVAILABLE for this item
Use PH Buffer pH4.0 Red 125ml & Buffer pH7.0 Green 125ml. To ensure that your pH meter gives accurate readings before every use.
A buffer solution is one which resists changes in PH when small quantities of an acid or an alkali are added to it. Acidic buffer solutions: An acidic buffer solution is simply one which has a PH less than 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts – often a sodium salt.
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