Top answers

Nitrous acid, HNO2, is a weak Bronsted-Lowry acid with a Ka value of 4.43x10-4 mol dm-3. Calculate the pH of 0.375 mol dm-3 of HNO2.

We know how to calculate pH from H+ concentration with the equation : pH = -log 10 [H+] So, we need to work out the concentration of H+ ions in 0.375 mol dm -3 of nitrous acid, HNO 2 . We're given the Ka val...
Answered by • Chemistry tutor
15251 Views

How do I differentiate: (3x + 7)^2?

We can see that (3x + 7) 2 is a 'composite function'. We can rewrite this as g(f(x)), where f(x) = 3x + 7 and g(x) = x 2 . As you will have learnt, you will need to use the chain rule for this type of differ...
LK
Answered by Lloyd K. • Maths tutor
5309 Views

What is the subjunctive and how do I use it?

The subjunctive is not a tense but a mood. Unlike the indicative, which is used to convey certainty, the subjunctive conveys doubt, desire or possibility, generally speaking. It has three forms in Spanish: t...
GH
Answered by George H. • Spanish tutor
2126 Views

What are the functions and processes of Parliament in holding the Executive to account?

The role of Parliament is split between the House of Commons and the House of Lords, and they both have different but compatible roles in holding the government to account over policy, actions and legislatio...
4106 Views

Can you explain the limiting reagents of photosynthesis?

I have taught this content to my students in the past and I followed the plan detailed below:Definition of photosynthesis and limiting reagents: process by which plants create carbohydrates from raw material...
PT
Answered by Peace T. • Biology tutor
2410 Views