The Hermione Granger Extravaganza Unmarked solutions of 0.1 M: NaCi HCI NaOH AgN

Question

The Hermione Granger Extravaganza Unmarked solutions of 0.1 M: NaCi HCI NaOH AgNO3 NazCO, H2SO4 Na3PO MgSO4 Cu(NO,)2 CuCl Fe(NO3)s Supplies: 12 test tubes 12 Pipettes Two 96-well plates "This isn't magic-it's logic- a puzzle. A lot of the greatest wizards haven't got an ounce of logic; they'd be stuck in here forever." -Hermione Granger from Harry Potter and the Sorcerer's Stone Your task today is to deduce the identity of 12 unmarked solutions by their interaction with each other- namely though precipitation reactions. The possible identities are listed at the top of this page. Precipitates that may be formed are on the next page. Begin by acquiring 3-5 mL of each solution in its own numbered test tube (you should also have a dedicated dropper for each solution so you do not cross-contaminate your unknowns!). Second: some of the solutions are acidic or basic and will therefore react with litmus paper, and this may help you identify them. Use a dropper to test each solution with litmus paper: Basic solution:Neutral solution: Acidic solution: Do nothing Turn red Red litmus will: Turn blue Do nothing Blue litmus will: Do nothing Do nothing

Explanation / Answer

ACID MEDIUM CHANGE LITMUS PAPER COLOUR BIUE INTO RED

BASIC MEDIUM  CHANGE LITMUS PAPER COLOUR RED INTO BLUE

IN NEUTRAL MEDIUM NO COLOUR CHANGE.

4- AgNO3

7-NaCl

12- MgSO4

6- MgCl2

9- Ag(PO4)3

serial number basic(red litmus paper) blue(acidic medium) result 1 nothing NOTHING NEUTRAL 2 NOTHING TURN RED ACID MEDIUM 3 NOTHING TURN RED ACID MEDIUM 4 NOTHING TURN RED ACID MEDIUM 5 NOTHING TURN RED ACID MEDIUM 6 TURN BLUE NOTHING BASIC MEDIUM 7 TURN BLUE NOTHING BASIC MEDIUM 8 NOTHING NOTHING NEUTRAL 9 NOTHING NOTHING NEUTRAL 10 NOTHING TURN RED ACID MEDIUM 11 NOTHING NOTHING NEUTRAL 12 NOTHING NOTHING NEUTRAL

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