Question

I had to write a scheme for a chemistry lab. I attached a link. The scheme is done but does have a few steps about steps. Thank you.

https://docs.google.com/document/d/1y7yl4vql095zLmJxZVnPRLSGbGGKj2bN5o6i3WoXO28/edit?usp=sharing

Answer 1

In step 2a - The second time I decant do I discard the supernatant and how do I make neutral.

Solution :- In the first step 6M HCl is used there fore solution is acidic to make it neutral you can use the NaOH solution but the pH should be checked by the pH paper to maintain the neutral pH so the only required amount of NaOH should be added so while adding the NaOH pH should be checked.

is 5 drops of NaOH good

Solution :- 5 drops of NaOH are good enough to precipitate out the Al3+ ions if present in the solution.

How do a get a few drop of the solution containing only Al3+?

solution :- To get the only Al3+ solution you can use aluminium nitrate solution which is soluble and have Al3+ ions.

Is five drops of NH3 good?

solution :- 5 drom NH3 are enough to precipitate out the Fe3+ ions if present any to give the oragish color precipitate so the 5 drop NH3 is enough.