Coursework.Info - Inspiration in an Instant

On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:

A Colorimetric Determination of Manganese In Steel Advanced Higher Chemistry Unit 1 PPA 2 Eilidh L Hawkins Candidate Number 972840254 The aim of this investigation is to determine the percentage Manganese in steel through colorimetric determination. Colorimetry is used to determine the concentrations of coloured substances in solution. It works on the basis that a coloured substance absorbs light of a colour complementary to its own and also that the amount of light absorbed (absorbance) is proportional to the substance's concentration. This technique is especially suited to determining the percentage manganese in steel because manganese can be converted into permanganate ions. Permanganate ions are coloured. There are two stages in the conversion: the first uses nitric acid to oxidise manganese to manganese (II) ions. Mn(s) Mn2+(aq) + 2e The manganese (II) ions are then oxidised to permanganate ions by potassium periodate. Mn2+(aq) + 4H2O MnO4-(aq) + 8H+ + 5e To find the filter which gives maximum absorbance. A burette was rinsed and...

Get instant access

• Instant, unlimited access to our documents in full
• Swap your work for free access, or pay £4.99
• To see the full version of this document and 145,970 others

OR

Receive email updates for this category

• Simply tell us your email address and receive a weekly Study Help Email for FREE
• Receive 3 FREE essay views with each email
• Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk