- Messages
- 84
- Reaction score
- 25
- Points
- 28
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Depends upon your targeted scoreI have the components C A D for my As level should I give a retake ....?
Please explain the questions i have attached.......Alright, Bishnu, typing my response to you.
Please explain the questions i have attached.......
ok broAgain busy with college admissions, will get back to you ASAP this week or later.
ok bro
Thanks bro!Third statement says that Ca+ will react with acids (HPO42- in this case). This is going against dissolving of enamel because the Ca+ will in fact react with HPO42- and directly conflict with statement 2's reaction, as it will encourage equilibrium of second equation to want to go back to the right side.
Thanks bro!
I didn't get this part. Why can't Ca++ react with acid? and How does it conflict the second statement? If Ca2+ is reacting with HPO42-, it will encourage the reaction to shift to Left in equation 2, isn't it?
Calculate the pH of the buffer formed when 10 cm3 of 0.1 m0ldm-3 NaOH is added to 10 cm3 of 0.25 moldm-3 CH3COOH, whose pKa=4.76
ANS : pH=4.58
How to calculate ? I know that need to use this formula pH= pKa + log ( conc. salt / conc. acid ) , but how to find the conc. of both solvents ?
What is your overall grade of Chemistry?I have the components C A D for my As level should I give a retake ....?
I think 1 only, 3 is ridiculous and 2 is not correct since PV=nRT, R + n+ V are constant so temp increase increase pressurehelp
correctI think 1 only, 3 is ridiculous and 2 is not correct since PV=nRT, R + n+ V are constant so temp increase increase pressure
again it is 1 only, because 3 means that pressure increase on both sides will be same, and 2 has same no. of moles on both sides of equation, however number 1 has 2 moles when equilibrium moves to RHS so increase in pressure will move the mercury up the right limbhelp.........
View attachment 62667 I need help with this. From March 2017 Paper 4 I only get 6 different carbon environments
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