5.3.2 - Making Insoluble Salts Flashcards

1
Q

What is a precipitate !?

A

A precipitate (ppt) is an insoluble solid that forms inside a solution

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2
Q

How do precipitates form !?

A

When the ions in a solution collide with each other, a ppt forms and slowly sinks to the bottom

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3
Q

How can you tel if a precipitate will form when mixing two solutions !?

A

. By mixing the ions up and seeing if either of the resulting compounds is insoluble

( if an insoluble compound is formed, it will appear as a precipitate )

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4
Q

How do we make insoluble salts by precipitation !?

A

. We make insoluble salts by mixing solutions to make a precipitate

( each solution should contain one of the ions needed to make it )

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5
Q

What are spectator ions !?

A

. They are ions which aren’t involved in making the precipitate, they remain in the solution as ‘leftovers’ .

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6
Q

What is an ionic equation !?

A

. A simpler equation for the reaction just involving the ppt

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7
Q

Step 1: separating salt from solution (made by precipitation)

A

. Filter out the salt precipitate
- the residue is the salt we want to keep

(The filtrate is the leftover solution)

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8
Q

Step 2: separating salt from solution (made by precipitation)

A

. Rinse the salt with water

(this washes off traces of the leftover solution)

(Salt doesn’t dissolve as it is insoluble)

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9
Q

Step 3 : separating salt from solution (made by precipitation)

A

. Dry the salt by dabbing it with filter paper

(This removes the last few traces of water, leaving us with a pure dry salt)

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