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Inorganic Chemistry
The solution of alkali metals in liquid ammonia is blue colour due to______
Inorganic Chemistry
Which of the alkali earth metal is not collected as alkali earth metals because its oxide is not alkaline ?
Inorganic Chemistry
Show by means of energy orbital diagrams how sodium hexachlorovanadate(II) exists as a
magnetic transition metal compound whereas tris(ethylenediammine)nickel(IV) nitrate is
unaffected by a magnetic field.
magnetic transition metal compound whereas tris(ethylenediammine)nickel(IV) nitrate is
unaffected by a magnetic field.
Inorganic Chemistry
In an experiment, 13.88 g of potassium propionate, C2H5CO2K, were weighed in a beaker and
dissolved in a small amount of distilled water. The mixture is transferred to a 100 mL volumetric
flask, made up to the mark and shaken well. 50.0 mL of this standard solution is mixed with 50.0
mL of a standard solution of propionic acid, C2H5CO2H in order to prepare a buffer solution of
pH 5.66. The molar mass of potassium propionate is 112 g mol-1
and the pKa of propionic acid is
4.87.
(i) What is the concentration of the propionic acid used to make the buffer? (4 marks)
5.0 mL of 5.0 M nitric acid were added to 100.0 mL of the buffer.
(ii) Give a chemical equation to show the effect of nitric acid on the buffer. (2 marks)
(iii) Calculate the new concentration of the propionic acid in the mixture. (
dissolved in a small amount of distilled water. The mixture is transferred to a 100 mL volumetric
flask, made up to the mark and shaken well. 50.0 mL of this standard solution is mixed with 50.0
mL of a standard solution of propionic acid, C2H5CO2H in order to prepare a buffer solution of
pH 5.66. The molar mass of potassium propionate is 112 g mol-1
and the pKa of propionic acid is
4.87.
(i) What is the concentration of the propionic acid used to make the buffer? (4 marks)
5.0 mL of 5.0 M nitric acid were added to 100.0 mL of the buffer.
(ii) Give a chemical equation to show the effect of nitric acid on the buffer. (2 marks)
(iii) Calculate the new concentration of the propionic acid in the mixture. (
Inorganic Chemistry
To determine the concentration of a Sn2+(aq) solution, a student titrated a 50.00 mL sample of acidified Sn2+(aq) with 1.44 mmol/L KMnO4(aq). The titration required 24.83 mL of KMnO4(aq) to reach the endpoint
Inorganic Chemistry
Explain, using appropriate diagrams, why most materials display positive thermal expansion. (4 marks)
Inorganic Chemistry
What are the key features of Rigid Unit Modes that allow for NTE? (5 marks)
Inorganic Chemistry
The two cubic oxides ReO3and BaRuO3both adopt a cubic perovskite type structure; however whilst ReO3displays Negative Thermal Expansion (NTE) between 10 and 250 K BaRuO3displays Positive Thermal Expansion (PTE) over the same temperature range. The occurrence of NTE in ReO3 has been explained using the concept of Rigid Unit Modes.
Given both ReO3and BaRuO3contain the same structural frameworks what is the likely cause of the absence of NTE in BaRuO3?
Given both ReO3and BaRuO3contain the same structural frameworks what is the likely cause of the absence of NTE in BaRuO3?
Inorganic Chemistry
Given both ScF3 and KCaF3 contain the same structural frameworks what is the like cause of the inhabitation of NTE in KCaF3
Inorganic Chemistry
Explain the observation that the diffraction peaks in nanoparticles of ZrO2are extremely broad but these sharpen remarkably as the material is heated.
