Titration Problem by Catherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco Catherina Macias CHM-1046-2225-4031 en-us 2022-07-22 20:13:28 UTC 2022-07-25 23:54:46 UTC hello@padlet.com https://padlet.net/icons/png/1f9ea.png A chemist titrates 241.7 mL of a 0.2700 M solution of acetic acid (HCH3CO2) with a 0.8500 M solution of NaOH. Calculate the pH of the acid solution after the chemist has added 13.96 mL of the NaOH solution to it. *The pKa of acetic acid is 4.70* maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248333261 2022-07-22 20:19:07 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248333261 First before starting the problem take a breather and have confidence that you can tackle this problem even if it feels like tackling you. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248336424 Now that we've got that out of the way let us read and determine if our problem is before, at, or after equivalence.]]> 2022-07-22 20:34:24 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248336424 So the first thing that should be done is to write out our balanced equation for acetic acid and NaOH. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248344267 2022-07-22 21:09:42 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248344267 Next, we need to calculate the volume of NaOH needed for equivalence by using the M1V1=M2V2 formula. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248394528 By finding V2 we see that our problem is before equivalence.]]> 2022-07-23 01:39:49 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248394528 Then, we have to find moles of HCH3CO2 and NaOH. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248421839 2022-07-23 03:25:57 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248421839 Next, we have to write the equation for the solution at equilibrium and create or BCA table. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248424018 2022-07-23 03:35:20 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248424018 Finally, we use the Henderson-Hasselbalch equation to find the pH. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248427428 Rounded to 2 decimal places the pH is 4.04!]]> 2022-07-23 03:50:36 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248427428 You have successfully solved a titration problem! As long as you solve step by step titration problems are a piece of cake! maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248429079 2022-07-23 03:58:06 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248429079 Hot Tip! Remember that to know if our problem is before equivalence we have to look at how much of our NaOH is being added to the solution. In this case, it is 13.96, and by calculating our V2=76.7752 we conclude that our problem is before equivalence. maciascatherina https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248432656 Let's just say for example if our NaOH solution that is being added is higher than our V2 than it is after equivalence, and if it is equal to it is at equivalence!]]> 2022-07-23 04:14:22 UTC https://padlet.com/maciascatherina/2uxvg97esf4pcwco/wish/2248432656