A 0.5g sample of cement is added to a flask and is placed in a hot water bath with ~20ml of ethylene glycol where it was mixed with a stir bar for 20 minutes. After 20 minute, the liquid was put through a vacuum filtration to collect the liquid. The filtrate was then transferred to another flask.
To the filtrate, 3.00ml of 0.1M HCl was added. 50ml of 0.005M potassium iodate, and 0.5g of solid potassium iodide was also added and dissolved. Starch indicator was added. It was then titrated with standard 0.005M Na2S2O3 (sodium thiosulfate) solution where the solution turned blue. Experimentally, it was determined that 31.12ml of the thiosulfate solution was required to titrate.
Determine the amount of free lime (CaO) present in the sample.
Reaction equations that may be useful...?
CaO (lime) + 2HCl ===> CaCl2 + H2O || (1) Excess HCl used to form iodine which is then detected by the sodium thiosulfate
6HCl + 5KI + KIO3 ===> 3I2 + 6KCl + 3H2O || (2)
I2 + 2Na2S2O3 ===> 2NaI + Na2S4O6 || (3) Thiosulfate ion reduces iodine into iodide ion
A 0.5g sample of cement is added to a flask and is placed in a hot...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cmº volumetric flask and making up to the mark. What is the molarity of the solution? b) A 10 cm3 aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (12) according to the following reaction: KOCI + 2HCl + 2K1 + 3KCl + H2O +...
how do I calculate the isolated moles and molarity
of the 0.2M
KIO3?
0.1 M Sulfuric Distilled Solution A Mixturel Mixture II Mixture III Mixture IV 0.20 M KIO3 Solution 5 mL 5 mL 10 mL 10 mL Acid 0 mL 0.5 mL 0 mL 0.5 mL water 15 ml 14.5mL 10 mL 9.5 mL Lalculations: I. (6pt) Calculate the total number of moles of iodate ion present in each 0.2 M KlO3 solution. Calculate the molarity of iodate ion...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...