You are Here: Home >< A-levels

# A level chem watch

1. 31. Dilution Effects for Moles Calculations•a )•i) n(NaOH) in 250cm3=4/40 = 0.1•ii) n(NaOH) in 25cm3= 0.1/10 = 0.01•iii) c(NaOH) in titration = 0.01x1000/25 = 0.4
•b)Lithium can be used to make Lithium Hydroxide••Li + 2H2O LiOH + H2•Lithium Hydroxide can be neutralised by Sulfuric Acid •2LiOH + H2SO4Li2SO4+ H2O••A student dissolved Lithium in water and made up the solution to 100cm3in a volumetric flask. •The student forgot to make a note of the mass of lithium used. •The student then decided to do a titration to work out how much lithium they used. ••10cm3of LiOH needed 12.5cm3of H2SO4(0.0200moldm-3) for complete neutralisation. ••i)Calculate the amount, in moles of LiOH that reacted?•ii)Calculate the amount, in moles of LiOH that was present originally in the volumetric flask.
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 30, 2017
The home of Results and Clearing

### 3,039

people online now

### 1,567,000

students helped last year
Today on TSR

The latest news

### University open days

1. SAE Institute
Animation, Audio, Film, Games, Music, Business, Web Further education
Thu, 16 Aug '18
2. Bournemouth University
Fri, 17 Aug '18
3. University of Bolton
Fri, 17 Aug '18
Poll

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets