During a lab, a student titrates 25.0 mL of a 0.0200 M hydrochloric acid solution with potassium hydroxide. the burette readings for the base were 3.5 mL initially and 28.6 mL at the end. find the concentration of the base.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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