A magician took yellow colured solution in one test tube and added a colourless solution Into It and announced the fun of getting red colour. Then he added red coloured solution into it and announced the fun of colour becoming lighter. What chemicals he musthave used and explain how all this might have happened ?

A magician took yellow colured solution in one test tube and added a c

1.	A magician took yellow colured solution in one test tube and added a colourless solution Into It and announced the fun of getting red colour. Then he added red coloured solution into it and announced the fun of colour becoming lighter. What chemicals he musthave used and explain how all this might have happened ?
Answer» Solution :He MUST have taken a ferric SALT , e.g., ferric nitrate solution (yellow) and added thicoyanate e.g., KSCN solution (colourless). The product formed is ferric sulphocynided complex, `[Fe(SCN)^(2+)` (red colour) . Then he must have added potassium ferrosulphocyanide which gives `[Fe(SCN)]^(2+)` IONS and the equilibrium shifts backward forming back ferric salt and thiosyanate so that intensity of red colour DECREASES.