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A solution of acetic acid and sodium acetate was prepared, by dissolving 4.1 g of sodium acetate in 750 cm^3 of 0.085 mol/dm^3 acetic acid, at 25 degrees. 10 Cm^3 of 2 mol/dm^3 HCl was added. Ka is 1.76*10^-5, calculate and explain the change in pH

The first thing to do in any calculations question is to list out what you have, and what the question is asking you. In this case, the question wants pH, which is -log[H+]. So what we need is [H+]. We have ...
AM
Answered by Alex M. • Chemistry tutor
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Express 5/(2-sqrt(3)) in the form a + b*sqrt(3)

The first step that needs to be taken is to get rid of the square root from the denominator. This can be done by multiplying the top and bottom of the fraction by 2 + sqrt(3). This gives (10 + 5 sqrt(3))/(4-...
GV
Answered by Guy V. • Maths tutor
12298 Views

How much of my personal statement should consist of academics and extracurricular activities?

With regards to GCSE and A Level results I would say try to mention them as little as possible as admissions officers already have access to this information so wasting precious words on an already tight wor...
SM
4002 Views

What are higher order functions in functional programming? How does the 'map' function work and why is it a higher order function?

Higher order functions either have one or more arguments that are themselves functions , return a function as their result, or both . Arguments to higher order functions can themselves be higher order functi...
JC
Answered by Joseph C. • Computing tutor
2268 Views

How do I approach writing an essay for the ELAT?

The ELAT is all about close language analysis; it is a test designed to highlight your ability to look at unseen passages. Fortunately, you have no contextual preparation to do for this exam, and it is argua...
LG
4908 Views