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What is the concentration (in M) of hydroxide ions (OH-) in a solution at 25.0%C with pH 2.305?2.02 x10-12 M4.95 x 10-6M 2.02 x 1012 M5.64 * 10-H1 M4.95 10 'M...

Question

What is the concentration (in M) of hydroxide ions (OH-) in a solution at 25.0%C with pH 2.305?2.02 x10-12 M4.95 x 10-6M 2.02 x 1012 M5.64 * 10-H1 M4.95 10 'M

What is the concentration (in M) of hydroxide ions (OH-) in a solution at 25.0%C with pH 2.305? 2.02 x10-12 M 4.95 x 10-6M 2.02 x 1012 M 5.64 * 10-H1 M 4.95 10 'M



Answers

What is the concentration of hydroxide ion in a $0.060 M$ aqueous solution of methylamine, $\mathrm{CH}_{3} \mathrm{NH}_{2} ?$ What is the pH?

16.54. We have the weak base and H 20 H. And 0.21 more concentration. And we want to find the concentration of the hydroxide ion. And to do that, you have to set up an ice box first you subtract X from the reactant and add extra products. We can approximate this to 0.21 because the K. Um the initial concentrations are point to one divided by the KB is going to be greater than 100 this will just be X. So you plug it into the KB expression which is the concentration of O H minus times the concentration of NH studio H plus over the concentration of the base and H. 20 H. So that would just be the KB. Which I looked up from the textbook 1.1 times 10 to the negative eight equals X squared over 0.21 And when you solve for X we get that X is 4.80 It one times 10 to the negative five Moeller. So that would be the concentration of O h minus and you need to 66 So it would just be 4.8 times 10 to the negative five Moeller. Mhm. So that would be your first answer and the second part as you to solve the ph of the solution. So to find the ph you first have to find the P. O. H. Since we have the hydroxide ion concentration, not the hydro sodium ion concentration. So to find the P. O. H, you just do the negative log of the hydroxide ion concentration which we found in a previous part, which gives you 4.31 as a P 32 as the people age. So the ph would just be 14 minus 4.32 which will give you 9.68 and you want to six figs because, and then ph and p o h. You look at the sick things after the decimal point, so these two would be your answer right here.

So we have this solution. The pH is 8.72. We want to know the hydroxide concentration. So from here we can calculate the age plus concentration by raising 10 to the power of the negative pH. So 10 toothy minus 8.72 is the H plus concentration. Not going to be very much 1.9 times 10 to the minus nine. That would be mole aridity. And that is theater plus concentration. And when we know the age plus, we can use the K W to calculate the hydroxide. Ion concentration eight plus is an abbreviation for H 30 plus the hydro Nia, my own e k w. One time center them on is 14 and, uh, I droney my on concentration h 30 plus or age plus is 5.2 times 10 to the minus six

Can question 54. We are asked what is the concentration of hydroxide in a .18, Mueller Aquarius solution of hydroxide? I mean it then wants to know what the phs well, they didn't give us a KB value. Hydroxy element as a base. So we need to look at the KB value. KB value from the back of the book is 1.1 times 10 to the -8. This is equal to the hydroxide concentration square divided by the initial based concentration minus the hydroxide concentration. If we assume that this hydroxide concentration is small with respect to the base concentration, small meaning less than 5%,, then this equation simplifies to where the hydroxide concentration is simply KB multiplied by the initial based concentration. And we have these two values Giving us a hydroxide concentration of 4.4 times 10 to the -5 moller. To get ph we need to take the negative log of the hydro knee um concentration. The hydro knee um concentration is going to be the hydroxide concentration divided into K W 1.8 times 10 the negative 14. So this ratio is the hydro knee um concentration. We take the negative log of that and we get a ph of 9.65

The concentration off hydroxide ions are always Marlys irons in pure water is tend to the bar minus seven. This is a very, very important number. You're gonna encounter it again and again and it is determined by experiment. It's beyond the school off this tutorial to explain the experiment. So I'm just gonna leave this year. But, um, a little more information is of the Ionic product of water, which is the product off. The concentration of hydro nya minds and hydroxide ions is 10 to the bomber and this 14 and seen since these two concentrations here are equal People also write this as concentration of Patagonia, Marin's eagles concentration of hydroxide ions, which is going to the bar minus seven.


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