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It comes from the constant that the charge on one mole of electrons is a faraday, or 96500 coulomb mol-1. Then given that the mole ratio of Cu to electrons is 1:2, given both the Faradays and mole ratio are on the bottom, you multiply 96500 x 2 to get 193 000. Its complicated, hence why I simplified it for Year 12 Chemistry.

@@billstapleton2071 ok, you just didn’t put the units in the equation. Where I go to school, you can get almost and entire question wrong simply for not using units in the equation, and I can see why. Numbers are just numbers unless you specify what they are.

@@thomaschirila6372 sorry if I confused you! This video was only ever designed to be a support for my students with their practical task. The calculation is actually not part of our Year 12 Chemistry course, it is only used so we can get a theoretical mass calculation to compare against. FYI, you do not need to put units in most of the exam question answers, as they are stated in the question. Units shouldn't need to be included in equations, only for the final answers, but thats just my opinion! All the best with your study!

Lol thank you random stranger...always nice to be loved!

Hi Naomi. If you don't rinse the burette, it will be a random error. It will affect your first one or two titrations, but once you have to refill the burette it will pretty much disappear and will no longer affect your results. Hope this helps!

@@billstapleton2071 thank you

Hi Rooba, I no longer run that website, but I am more than happy to send them to you via DropBox. You should be able to access them here: www.dropbox.com/sh/30wb30wgpmquyju/AAAL_Y1gJ4tcGzqJ-nRokoJNa?dl=0 Please let me know if it doesn't work!

@@billstapleton2071 Thank you so much!

Glad it was helpful!

Glad I could help!

You're so welcome!

Thanks! Great to hear from you! Hope you are doing well

You're very welcome!

Welcome! Glad to hear that it helped

They are glass markers on a glass screen. Can get them at most newsagents or office supply stores. Thanks for asking!

Thanks! Appreciate the support

Thanks! Let me know if there is something else you want a video on

Hi sorry didn’t see this, how can I help?

Hi Drizzy, if you do not fill below the tap then it is a random error as the titre value will appear higher than it should be. You are correct in that to perform a titration correctly, you must fill below the two before your first titration

Thanks dude can you tell me few errors like systematic, human and random for a titration for KHP Vs NaOH please. Also how I could reduce them as well the errors.

Lol, it’s actually just that I write normally and flip the video in editing, I am actually right handed.

@@billstapleton2071 oh i see, great video

Glad it was useful! Thanks for the nice comments

Lol, you trolling me Alice? Thanks for the comment though! Hope you are well!

@@billstapleton2071 I am very well, thank you for asking! Still suffering from chemistry in uni lol!

The purpose of the flame is to vapourise the sample. The flame evaporates off the solvent that the sample is in, and it doesn't interfere with the energy absorbed as it is not the specific wavelength of the atoms in the sample, so is not absorbed by the atoms. Hope this makes sense?

@@billstapleton2071 Ok that makes sense! Thanks so much for the reply.

Max Ahmed how’d you go? Do I need to move? Hope the video helped!

Bill Stapleton helped me finally understand the difference between systematic and random error the practical exam went great

Susan this is deadset the best comment I have ever had. Made me laugh, thanks heaps! Glad it helped

@@billstapleton2071 Thanks so much for reading the comment. I am glad you liked it. I actually did get an ice-coffee before I continued with the video as there was one in my fridge so....