| http://www.w3.org/ns/prov#value | - For example, a buffering system including citric acid and sodium hydroxide can provide an exemplary pH of between about 2.2 and about 6.5, a buffering system that includes sodium citrate and citric acid can provide an exemplary pH of between about 3.0 and about 6.2, a buffering system that includes sodium acetate and acetic acid can provide an exemplary pH of between about 3.6 and about 5.6, and a
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