Other Chemistry Answers

If a 0.3753g of sample of sodium bicarbonate (80.9%) is titrated with 0.9155N sulfuric acid, what volume of the acid should be required to produce an endpoint?

Ethyl 2-methylbutyrate is an ester that contributes significantly to apple's smell.

However, when heated this ester undergoes thermal decomposition into other compounds that do not smell of apple.

The rate law for the thermal decomposition of this ester was found to be:

rate = k [ester]

The rate constant k was found to be 0.025 min–1 at 95 oC.

Given that the initial concentration of this ester was 18.0 μmol dm–3 in an apple jam that was then baked at 95 oC for 15 minutes in a sealed container.

Calculate the concentration of the ester remaining at the end of the baking time. Assume there were no loss of the ester except for the decomposition concerned.

Give your answer in μmol dm–3, correct to 3 s.f. Do not type the units.

Peace be upon you. I hope someone has an answer to my question, please answer (in the experiment of estimating calcium by weight, if we calibrated with potassium permanganate and the color appeared brown, what is the reason for the appearance of the color brown) and thank you...