Chemistry, 17.08.2021 18:00 jesus319

What is the pH of a solution with [OH-] = 2.0 x 10-10 M?

Answers: 2

Show answers

Answers

Answer from: kaitlyn7077

4.30

Explanation:

[

]

[

−

]

−

Substitute the known values.

[

]

[

2.0

−

]

−

[

]

−

2.0

−

[

]

−

The formula to determine the pH of the solution is as follows:

−

log

[

]

Substitute the known values.

−

log

[

−

]

4.30

Therefore, the pH of the solution is 4.30.

Answer from: kat5669

it has two answers first :-

We find

≅

Explanation:

We interrogate the equilibrium:

⇌

−

We know that in aqueous solution under standard conditions that:

[

]

[

−

]

−

We take

log

OF BOTH SIDES:

log

[

]

log

[

−

]

log

(

−

)

But by definition, the logarithmic function is that power to which you raise the base to get the specific answeri.e. if

log

, then

And thus

log

(

−

)

−

And so

log

[

]

log

[

−

]

−

log

[

]

−

log

[

−

]

But we define

−

log

[

]

, and

−

log

[

−

]

, and so

And now finally,

−

(

−

log

(

2.0

−

)

4.30

Explanation:

2 method :-

Right off the bat, if you don't understand the

general concepts of pH and pOH, I suggest you watch this 5-minute video before proceeding to read this answer.

Recall that pH is an index for describing the concentration of hydronium ion. Mathematically, pH is described as:

−

log

[

]

A common mistake to make in this sort of problem is to move too quickly, and take

−

log

(

2.0

⋅

−

)

, and get your pH as 9.70. This is wrong, because you're not given a hydronium ion concentration, but a hydroxide ion concentration. Therefore, what you've calculated is really something called the pOH, not the pH.

So how do you work this out? Basically, you'll need to know that the product of the concentration of hydroxide and hydronium ions in a solution will always equal

−

Mathematically speaking:

[

]

[

−

]

−

Taking the negative log of both sides of the equation yields:

Given this, there's 2 ways to do this problem. Method one is to use the 1st equation, and solve for

[

]

. Then, you just take the negative log of that.

Method 2 (easier, in my opinion) is to solve for the pOH, and then subtract it from 14.

Either way, you should get an answer of 4.30.

Do a reality check: your concentration of hydroxide is very small. Therefore, your pOH value would be fairly large, meaning that your pH would be small. This aligns with what we got.

Hope that helps :)

Answer from: Quest

If you explain it more through i will answer it : )

Answer from: Quest

Perimeter? wheres the answers

Another question on Chemistry

Chemistry, 22.06.2019 01:20

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

Answers: 2

Answer

Chemistry, 22.06.2019 07:40

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

Answers: 2

Answer

Chemistry, 22.06.2019 12:30

Define the kinetic molecular theory

Answers: 1

Answer

Chemistry, 22.06.2019 21:00

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon