| http://www.w3.org/ns/prov#value | - For example, when polyacrylic acid is used as the acidic water-swellable, water-insoluble polymer and sodium hydrogen carbonate is used as the basic second material, an acidic buffering agent, such as citric acid, is generally required in order to maintain the pH profile in a desirable range because sodium hydrogen carbonate is more soluble than the polyacrylic acid.
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