SincPsyco
Badges: 13
Rep:
?
#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.
0
reply
macpatgh-Sheldon
Badges: 20
Rep:
?
#2
Report 1 year ago
#2
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
……………......………
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should there be a new university admissions system that ditches predicted grades?

No, I think predicted grades should still be used to make offers (675)
33.62%
Yes, I like the idea of applying to uni after I received my grades (PQA) (856)
42.63%
Yes, I like the idea of receiving offers only after I receive my grades (PQO) (386)
19.22%
I think there is a better option than the ones suggested (let us know in the thread!) (91)
4.53%

Watched Threads

View All