pH solutions:

RECIPE 1:
pH 2: 25ml 0.2M potassium chloride plus 13ml 0.1M hydrochloric acid made up to 250ml with distilled water.

pH 6: 50ml 0.1M KH2PO4 potassium dihydrogen phosphate (potassium dihydrogen orthophosphate) plus 5.6ml 0.1M Sodium hydroxide made up to 250ml with distilled water.

pH 10: 25ml 0.2M potassium chloride plus 50ml 0.1M boric acid (H3BO3) plus 43.7ml 0.1M sodium hydroxide made up to 250ml with distilled water.

RECIPE 2:
pH 2 use 0.01M hydrochloric acid

pH 6 37ml 0.1M citric acid plus 63ml 0.2M disodium hydrogen phosphate

pH 10 use 0.1M sodium hydroxide

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