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we do add KCl to water for the measurement of pH to prevent CO2 from dissolution in water and forming of H2CO3
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Standardization of sodium thiosulphate by potassium iodate?
1. Firstly wash out a burette twice with distilled water. 2. Clean the washed burette with the approximately 0.1 mol dm-3 standardised sodium thiosulphate, which is going to be prepared. 3. Fill the burette with approximately 0.1 mol dm-3 standardised sodium thiosulphate, until the bottom of the meniscus is at the 0 cm3 mark on the burette. 4. Pipette 25cm3 of 0.020 mol dm-3 potassium Iodate solution into a 250 cm3 conical flask. 5. Using a 10cm3 measuring cylinder, measure out 10cm3 of 0.5 mol dm-3 potassium iodide and add it to the conical flask. 6. Using a 10cm3 measuring cylinder, measure out 10cm3of 1 mol dm-3 sulphuric acid and add it to the conical flask. At this stage the three solutions will be mixed together in the conical flask, to produce iodine. 7. Record the initial reading on the burette (0 cm3) to work out the titre, record this to two decimal places 8. Turn the burette tap, so the 0.1 mol dm-3 sodium thiosulphate pours into the iodine in the conical flask (adding small amounts and then stirring the conical flask) 9. When the red/brown iodine solution in the flask turns yellow, stop titrating the 0.1 mol dm-3 sodium thiosulphate into the flask 10. Add a few drops of the starch indicator to the conical flask; it will turn dark blue/black colour to intensify the colour change. 11. Turn the burette tap back on, add the 0.1 mol dm-3 sodium thiosulphate drop wise, whilst swirling the flask, until the dark blue/black colour disappears. 12. Record the final burette reading, from the point where the bottom of the meniscus is. 13. Record the result in the table, and then calculate the titre value by finding the difference between the initial reading and the final reading. 14. Repeat the titration to obtain concordant results, whereby the titre is 0.1 cm3 difference at max. 15. Obtain all your results and present them in a table, to two decimal places.
How do you find mole?
ok moles = concentration x volumemoles is measure in molconcentration in mol/dm^3volume in dm^3so the conc. of an acid is 1.5mol/dm^3 and its volume 100cm^3you must convert cm^3 to dm^3 to do this divide cm^3 by 1000and that i how to work out moles
Why sodium only slips than other ions in SAC in dm plant?
what are main reasons for slippage of sodium and silica in sac in dm plant what are steps to take for eliminating the slippage of sodium and silics
At stp condtions 11g of SO2 have a volume of?
volume is 3.85 cubic dm. or litre.....
Does demineralised water contain chlorine?
Yes, it does. We studied this in our 5th grade science class. You have to add a chemical to get rid of the chlorine. So i wouldn't sugest u fill up a bowl of fauset water and put a fish in it. With too much chlorine it can kill a fish.
Is 5 dm the correct measurement of a skateboard?
5 dm
What does the measurement DM stand for?
decimeter
What is a unit of measurement abbreviated dm?
DM = decimeter (1/10 of a meter)
What does dm mean in measurement?
it means decimeter in math...
Which measurement is largest 10km or 1000cm?
1000cm
What is conductivity and pH value of dm water?
ph of DM water is 6.5 to 7.1 conductivity of Dm water is near 000
What are the quality maintain for dm Water?
what will be the TOC content in DM water
What is the unit of conductivity of dm water?
Unit of dm water conductivity is microsiemens/cm
What is the answer of 2 dm 2 cm 2m that are the largest measurement?
2 m
What are 5 methods of measurement?
cm, meters, dm, km, mm for canada
What does dm stand for in math measurement?
decimetre, 1/10 or 0.1 of a meter
Does copper carbonate dissolve in water?
The easiest measurement to determine the solubility of a compound in water is the solubility product. Copper carbonate has a Ksp value of 1.6 x 10-5 mol2 dm-6. So it is slightly soluble in water.
