SincPsyco
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#1
Report Thread starter 1 year ago
#1
Lactulose can also be used to treat people who have too high a concentration of
hydrogen ions (H+
) in their blood.
The normal range for blood H+ concentration is 3.55 × 10−8 to 4.47 × 10−8 mol dm−3

A patient was found to have a blood H+ concentration of 2.82 × 10−7 mol dm−3

Calculate the minimum percentage decrease required to bring the patient’s blood H+
concentration into the normal range.
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macpatgh-Sheldon
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The normal range for blood H+ concentration is 3.55 × 10−8 to 4.47 × 10−8 mol dm−3

A patient was found to have a blood H+ concentration of 2.82 × 10−7 mol dm−3


OK you need the %age reduction from 2.82 X 10-7 to 4.47 X 10-8 (this latter one is the higher of the normal range so will give the minimum value needed).

First, make the exponent the same in both:

So we need %age reduction from 28.2 X 10-8 to 4.47 X 10-8

You can now ignore the exponents:-
SO: Reduction needed = (28.2 - 4.47)/28.2 X 100
……………......………
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