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Explain the interplay between enthalpy (H) and entropy (S) changes taking place during ligand binding. someone help please
I was asked three questions... Describe photo stability of silver halides. Is decomposition of silver halides a redox reaction? Describe how these reactions are used in phhotography. I really dnt undastand and I am the only person in my class. I am scared to ask the teacher!!!!!!!!!!!
4.00 g of lawn sand (a mixture of sand and ammonium sulphate) was weighed into a conical flask, and 25 cm3 of 2.0 mol dm-3 Sodium hydroxide solution was pipetted into the same flask. The conical flask was boiled for 20 minutes, after which time all the ammonia had been driven off, because:
(NH4)2SO4(s) + 2NaOH (aq) 2NH3 (g) + Na2SO4(aq) + 2H2O(l) The residue in the flask was cooled and filtered to remove the sand. The filtrate containing unreacted NaOH was made up to 250cm3 in a volumetric flask. 25cm3 samples of this solution were titrated against 0.1 mol dm-3 hydrochloric acid using bromothymol blue as an indicator.
HCl + NaOH NaCl + H2O The mean titre was 20.0 cm3. Calculate the percentage of ammonium sulphate by mass in the lawn sand.
Please help this is due in tomorrow!