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If a urine sample has a pH of 5.50, calculate the concentrations of Hz0+ and OH in the sample.
[H30+] = 1
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According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

The answer is:   [d]:   "ultraviolet" {"  uv  "} .

The basic unit of a chemical element