Ha and hb are two strong monobasic acids.
25.0cm3 of 6.0 moldm-3 ha is mixed with 45.0 cm of 3.0 moldm-hb.
what is the h*(aq) concentration, in moldm-3, in the resulting solution?
a 1.9. c 4.1
b 2.1. d 4.5

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Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: