what is the ph at the equivalence point in the titration of 100 ml of 0.10 m hcl with 0.10 m naoh? This is a topic that many people are looking for. bluevelvetrestaurant.com is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, bluevelvetrestaurant.com would like to introduce to you How to Solve Titration Problems (HCl + NaOH). Following along are instructions in the video below:
A lot of requests for acid base titrations. So here we go what is the the ph of a solution when you mix 75. Million.
02 molar hcl with 50 of 01. Molar naoh a lot of information going on here show you exactly what to do to solve any titration problem. You can just follow this four step process if youre asked for the ph balanced chemical reaction find the number of moles of each reactant assume that your reaction goes completely how much of each chemical remains or how much did you produce and then use those amounts to get a ph.
So lets do this. Write. A balanced chemical reaction hcl and naoh together hcl plus n.
A o h. Acid. Base neutralization the h from one reacts with the oh h from the other it gives us water.
And whats left over well. I see sodium and chloride. So.
Whats left over is sodium chloride doesnt take a genius to figure that one out bam balanced chemical reaction that was me checking to make sure i had the same number of each atom on both sides. Calculate the number of moles of each reactant to start with well. How do you find the number of moles of hcl.
Well. The answer is the number of moles is the concentration times. Volume so for hcl the concentration was.
02 moles per liter the volume was 0075 liters. I devided milliliters by a thousand to get that doing this on my calculator two times point zero seven five. I get zero point zero.
One five moles of that hcl gotta do the same for my naoh you know. Concentration. 01 molar my volume zero point ill make that so you can see it.
005 liters when i multiply though is 01. Times point zero five i get zero point zero zero five moles. All right.
Which one do i have more of this one so let me just write these below my chemical reaction for you i have zero point zero. One five moles of that zero point zero zero five moles of that what do i make well they react in a one to one ratio. So im going to run out of this one first since it has the least this is my limiting reagent obviously all of my naoh is going to be used up so.
I now have zero of it im going to use up that much of my hcl. I have that much remaining and i can only make one of these for every one of these that i use up so im going to get zero point zero five of those and zero point zero. Oh.
Its zero zero. Five zero point zero zero. Five zero point zero zero.
Five. Okay. Lets recap that these two react.
I ran out of this first it all disappears i notch this down by that amount because im reacting that much of it away so im down to point zero. One and i make point zero zero five of this and i make point zero zero five of that now that ive predicted how much of each chemical remains or was produced i use those amounts to get the ph all right no naoh dont have to worry about that my calculation water doesnt affect ph at all so i have to worry about that my ph calculation and nacl also does not affect ph. I know that for a couple reasons.
Number one sodium is the conjugate of sodium hydroxide. Which is a strong base. So the na doesnt affect ph.
This is the conjugate of hydrochloric acid. Which is a strong acid so it doesnt affect ph im sure you can also look up a ka or kb for nacl and just see that its astronomically low long story short these salts arent often going to factor into the calculation. That doesnt affect ph at all either what does the hcl does and how do you calculate the ph.
When you already have the concentration of your strong acid paste the cake son. The ph is negative log of the concentration of h in this case because its a strong acid its the negative log of zero point zero one and so my resulting ph is negative a log a point zero. One that ph of the resulting solution is to good work everyone.
But again this is how you do a balanced chemical reaction check number of moles of each reactant check assume complete reaction and figure. How much of these remain and how much of these are produced check use that information to get your ph doesnt affect ph. Because theres none left doesnt affect ph because its water doesnt affect ph because its one of these loser salts that doesnt affect the ph.
The only thing that does affect. It is leftover hcl and that gives me a phi2 best of luck. .
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