Measure the pH of water soluble substances in aqueous mixtures using Indigo litmus paper & test strips. Your health, food & water testing, electroplating and more are all processes that depend on pH balance.
For simply confirming acid or alkaline conditions, red & blue litmus paper will do. For more exact pH values of hydrogen ion concentration, choose a specific acid base indicator strip for the accuracy & range you are investigating.
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There are no specific hazards associated with the pH test strips or litmus papers themselves. However, caution is advised with handling the acidic and alkaline chemicals themselves. Extreme caution is advised in handling strong acids & bases. Gloves and especially goggles are recommended. Chemically resistant aprons should be worn for very strong acids (pH 0,1) & very strong bases (pH 13,14).