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16 July, 00:53

A chemist needs a solution of tannic acid 70% pure. How much distilled water must he add to 5 gallons of acid which was 90% pure to obtain the 70% solution?

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  1. 16 July, 02:41
    0
    Answer: 1.4286 gallons

    Step-by-step explanation: the equation would be:

    0.9*5+0x=0.7 (5+x)

    then you can shorten it down to:

    4.5=3.5+0.7x

    subtract both sides by 3.5 and you end up with:

    1=0.7x

    divide both sides by 0.7 and you get 1.4286 gallons
  2. 16 July, 04:17
    0
    30; If you add and subtract these numbers you should get 30%
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