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OCR A-level Chemistry B (Salters) Paper 1 - 10th June 2025 [Exam Chat]

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Reply 180

Darcey08374

On the multiple choice did people not get many As?

Reply 181

anonymous6778589

Original post

by Aaradhy

HA= [H+][A-]/Ka

wait no yeah i did this , this is actually the equation i used i think, i'm losing memory of it more and more each second lol

Reply 182

Aaradhy

Original post

by lillyb0193

it asked to create an ionic equation when iodide reacts with BrO3- to produce water, iodine and bromide ions

i did bro3- + 6h+ + 2I———> I2+ Br- + 3H2o

Reply 183

Aaradhy

Original post

by anonymous6778589

wait no yeah i did this , this is actually the equation i used i think, i'm losing memory of it more and more each second lol

did u do ka = 10^-7.2?

Reply 184

bran747

Guys what was the structure of cooh I put trigonal prymidal but idk ibr

Reply 185

natylamine

Original post

by Darcey08374

On the multiple choice did people not get many As?

yes but there were alot of C's i think

Reply 186

anonymous6778589

Original post

by Aaradhy

did u do ka = 10^-7.2?

yepp

Reply 187

Aaradhy

Original post

by anonymous6778589

yepp

im not sure then maybe you put it in ur calculator wrong?

Reply 188

anonymous6778589

Original post

by bran747

Guys what was the structure of cooh I put trigonal prymidal but idk ibr

i put triganol planar

Reply 189

anonymous6778589

Original post

by Aaradhy

im not sure then maybe you put it in ur calculator wrong?

probably, hopefully this means i might get a few method marks, or had a frenzy in the exam where i didnt correctly rearrange the equation right like ive done about 2 million times before idk

Reply 190

anonymous6778589

What did everyone get for the percentage uncertainty qu? did u multiply 0.5 by 2?

Reply 191

Aaradhy

Original post

by anonymous6778589

What did everyone get for the percentage uncertainty qu? did u multiply 0.5 by 2?

yeah i got 15.4%

Reply 192

anonymous6778589

Original post

by Aaradhy

yeah i got 15.4%

okay great same

Reply 193

anonymous6778589

Original post

by natylamine

and H+ was 10^-7.4i think? and the conc of the other compound was 0.02 so A- = 0.02

yeah i did this 😭 bro idk what happened

Reply 194

Aaradhy

Original post

by natylamine

and H+ was 10^-7.4i think? and the conc of the other compound was 0.02 so A- = 0.02

yeah

Reply 195

Chris_____

so was it 3g or 7g?

Reply 196

natylamine

Original post

by Aaradhy

yeah

i literally dont get how its not 7.61 :s-smilie:

Reply 197

Chris_____

i swr is 3. as conc of H+ = 10^-7.2, Ka= 10^-7.4, Ka = [A-][H+]/[HA]. Then switch [HA] w Ka, which gives conc. Conc x 2 gives mol. Mol x Mr gave 3.03g

Reply 198

Tarquinn Harford

Original post

by Conoopz

Same but I’d take my answer with a pinch of salt 🧂

Which question is that for? I wasn’t sure about the disproportionation question, I just put caesium trioxide (IV)

Reply 199

anonymous6778589

Original post

by Chris_____

i swr is 3. as conc of H+ = 10^-7.2, Ka= 10^-7.4, Ka = [A-][H+]/[HA]. Then switch [HA] w Ka, which gives conc. Conc x 2 gives mol. Mol x Mr gave 3.03g