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1 year ago

When potassium permanganate is stirred in water, it turns to purple. How would

Chemistry

1 answer:

timama [110]1 year ago

6 0

Mixture because your pouring something into it then stirring it i don’t know.

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Solid NaBr is slowly added to a solution that is 0.073 M in Cu+ and 0.073 M in Ag+.Which compound will begin to precipitate firs

saul85 [17]

Answer :

AgBr should precipitate first.

The concentration of $Ag^+$ when CuBr just begins to precipitate is, $1.34\times 10^{-6}M$

Percent of $Ag^+$ remains is, 0.0018 %

Explanation :

$K_{sp}$ for CuBr is $4.2\times 10^{-8}$

$K_{sp}$ for AgBr is $7.7\times 10^{-13}$

As we know that these two salts would both dissociate in the same way. So, we can say that as the Ksp value of AgBr has a smaller than CuBr then AgBr should precipitate first.

Now we have to calculate the concentration of bromide ion.

The solubility equilibrium reaction will be:

$CuBr\rightleftharpoons Cu^++Br^-$

The expression for solubility constant for this reaction will be,

$K_{sp}=[Cu^+][Br^-]$

$4.2\times 10^{-8}=0.073\times [Br^-]$

$[Br^-]=5.75\times 10^{-7}M$

Now we have to calculate the concentration of silver ion.

The solubility equilibrium reaction will be:

$AgBr\rightleftharpoons Ag^++Br^-$

The expression for solubility constant for this reaction will be,

$K_{sp}=[Ag^+][Br^-]$

$7.7\times 10^{-13}=[Ag^+]\times 5.75\times 10^{-7}M$

$[Ag^+]=1.34\times 10^{-6}M$

Now we have to calculate the percent of $Ag^+$ remains in solution at this point.

Percent of $Ag^+$ remains = $\frac{1.34\times 10^{-6}}{0.073}\times 100$

Percent of $Ag^+$ remains = 0.0018 %

3 0

3 years ago

A diver dives off of a raft - what happens to the diver? The raft? How does this relate to Newton's Third Law?

sukhopar [10]

Answer:

Reaction Force!!

Explanation:

The diver moves “forward" and dives into the water. The raft moves "backwards” in the water because of the reaction force. The action force is the diver pushing off of the raft, and the reaction force is the raft pushing back on the diver (causing the diver to go forward and into the water).

Hope this helps you!!!

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2 years ago

CHEMISTRY QUESTION 20 pts.... URGENT

Damm [24]

Answer:

E i is like Math so I think this will help you

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3 years ago

A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over

hoa [83]

B. Molecules in both the metal and the surrounding air will start moving at higher speeds.

8 0

3 years ago

How can you tell states of matter apart?

sergejj [24]

You can tell them apart from its form.

If it forms loose and needs like a container to hold it up, that's liquid.

If it is hard and stable, definitely a solid.

And if you barely see something very loose (and normally goes up), that's liquid.

8 0

3 years ago

Read 2 more answers