Inorganic Chemistry Answers

250 mg of caco3 was dissolved in hcl and the solution was made 250 ml with distilled water. 50 ml of the above solution required 20 ml of edta solution [standardization part]. 50 ml of hard water sample consumed 25 ml of edta with ebt as indicator [total hardness]. calculate the total hardness of water sample in ppm.

4. a. Consider the data below for the reaction H2O(l) ⇌ H2O(g) .

Plot a graph and determine ΔH and ΔS for the reaction. Describe how they influence the
spontaneity of the reaction as a function of temperature.
T (°C) P (torr)
0.0 4.579
10.0 9.209
20.0 17.53
25.0 23.76
30.0 31.82
40.0 55.32
60.0 149.4
70.0 233.7
90.0 525.8



b. Explain how the boiling point temperature of H2O(l) (at sea level) can be accurately determined from the data in a.?


c. For the reaction in a., ΔE is less than ΔH. Explain.

When the terminal phosphate is cleaved from the adenosine triphosphate molecule, the products are adenosine diphosphate and inorganic phosphate, ATP + H2O ––> ADP + Pi, where Pi stands for the various forms of phosphate that exist at the pH of the particular solution. If the total concentration of Pi is 2.5 x 10–2M, what are the concentrations of the predominant forms of phosphate that exist at pH 7.4?

At certain conditions of temperature and pressure, 15% of nitrogen and hydrogen react to form ammonia. Calculate the mass of ammonia produced when 2.80 tonnes of nitrogen react with excess hydrogen under these conditions.

electronic configuration of As

MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O
If 39.1 grams of MnO2 reacts with 48.2 g of HCl, and 19.8 grams of Cl2 was collected, what is the percent yield?

a)You want to prepare 1.00 L of a buffer solution with a pH of 3.5. You are given an 0.45 M solution of nitrous acid, HNO2, and an 0.68 M solution of NaOH. What volume of each of these solutions must be mixed in order to get the desired buffer solution? Use the simultaneous equations method to solve this problem.

b)If the acid used in a. was nitric acid, HNO3, could the same buffer solution be made? Briefly explain.

c)If the buffer solution prepared in a. also contained ~10^–6M Ni^2+ and ~10^–6 M Pb^2+ , could those metal ions be separated from each other by saturating the solution with H2S? Explain your answer by showing the necessary calculations.