Inorganic Chemistry Answers

If I have an aqueous solution of H2O2 and the density is 1,11g/mL. Would the density of H2O2 be 0,11g/mL? If not, what would the density be?

Given that the mean relative atomic mass of chlorine prepared in the laboratory is 35.5 and assuming that chlorine contains two isotopes of mass no 35 and 37, what is the % age composition of the isotope of mass no of 37?

Suppose 735 mg of quercetin in 100 mL water were extracted with an equal volume of isopropyl ether. The layers were separated and the ether was evaporated. The residue was found to contain 585 mg of quercetin. What is the distribution constant K?

Suppose 735 mg of quercetin in 100 mL water were extracted with an equal volume of isopropyl ether. The layers were separated and the ether was evaporated. The residue was found to contain 585 mg of quercetin. What is the distribution constant K?

Solid ammonium chloride undergoes sublimation on heating. In the vapour phase ammonium 

chloride decomposes to give NH3(g) and HCI(g). The following equilibrium is established. 

 NH4Cl(s) ⇌ NH3(g)+ HCl (g)

 What is the number of 

i) phases in the system, 

ii) components in the system, and 

 iii) degrees of freedom of the system?

How many metric tons (t) of oxygen are in a sample of pitchblende that contains 2.3 t of uranium?

(Hint: Sample of 84.2 g pitchblende contains 71.4 g of uranium and oxygen is the only other element present

[B2(OH)4(O2)2]2-. Sodium perborate has the empirical formula NaBO3.4H2O,

Dissolve 4.77 g of sodium tetraborate decahydrate (borax) and 1.0 g of NaOH in 30 ml distilled water. Cool the solution in ice and slowly add 5.6 g of 30 % H2O2 solution. Sodium perborate will slowly begin to crystallise. Suction filter the cold solution rapidly through a filter pater. Retain the filtrate to see if further crystallisation occurs. Repeat filtration if further crystallization occurs, and combine the solids. Wash the product with cold distilled water and then with ethanol and finally with a small quantity of diethyl ether. Allow to air dry on a filter paper and determine the yield.

Post lab questions

• Write a balanced reaction equation for the preparation of the product. Na2B4O7.10H2O + ___H2O2 + __NaOH + ____H2O products

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• Starting with 4.77 g of borax, determine the theoretical yield. From your experimental yield, calculate the percentage yield. Actual yield is 5.4809g

Write down the electronic configuration of Ca20 and Sr 38 and their ground state spectral terms.

Cr2O7-2+Cl^- ->Cr⁺³+Cl

 0.3749 g soda ash sample is analyzed by titrating sodium carbonate with the standard 0.2388M HCl solution, requiring 49.38ml. The reaction is:

          CO₃^2-  + 2H⁺     →   H₂O +CO₂

Calculate the percent sodium carbonate in the sample