Other Chemistry Answers

The solubility of Al(OH)3 is 5.15 x 10-7 g/ℓ. Calculate the Ksp of Al(OH)3.

Calculate the mass of 0.000423 mol sodium borate, Na2B4O7.10H2O and express

the answer in milligrams. 

Determine the volume of ethanol, CH3CH2OH, that is in 70 mL of 42%(v/v) red

wine. 

A solution contains 12.6 ppm of dissolved Ca(NO3)2. Calculate the concentration 

of NO3



in moles per litre. (4)

Calculate the mass of potassium hydroxide, KOH, required to prepare a 200 mL

solution that was diluted to give a concentration of 0.030 mol/L. The solution has

a dilution factor of 5.

A solution of Ba(OH)2 was standardized against 0.1016 g of primary standard 

benzoic acid C6H5COOH. Calculate the concentration of Ba(OH)2 if the end point 

was 20.89 mL. 

A piece of titanium metal with a mass of 20.8 g is

heated in boiling water to 99.5°C and then dropped

into a coffee cup calorimeter containing 75.0 g of

water at 21.7°C. When thermal equilibrium is reached,

the final temperature is 24.3°C. Calculate the specific

heat capacity of titanium.

25cm3 of 0.018 of potassium permanganate is pipetted into a conical flask,some dilute sulphuric acid and excess potassium iodide are then added and the liberated iodine is titrated in sodium thiosulphate of unknown concentration ,

Average titration figure is 15.6 cm3

a)write the equation for the two reactions hence find the mole ratio

b)calculate the concentration of sodium thiosulphate in moles per litre

calculate enthalpy for ethanonl combustion using bond enthalpy calculations