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Zinc and hydrochloric acid react according to the reaction: Zn + 2HCl → ZnCl2 + H2 . If 0.3 mol of Zn is added to 0.52 moles of HCl ,what volume of H2 is produced
Activity 7.2
Balance the reactions below using the change in oxidation number method.
- PbO2 + HBr PbBr2 + O2 + H2O
- PbO + NH3 Pb + N2 + H2O
- KBr + KClO2 + H2SO4 Br2 + KCl + K2SO4 + H2O
- Br- + ClO- + H+ Br2 + Cl- + H2O
- Sn2+ + VO43- + H+ Sn4+ + V2+ + H2O
Acetylsalicylic acid, HA is an active ingredient in aspirin, has Ka value of 3.0 x10-5 . In order to determine its chemical reactivity, 0.1 mole acetylsalicylic acid is dissolve in 1L of water.
a) Calculate the concentrations of all species in the acetylsalicylic acid solution [6 marks] b) Determine the pH of solution [1 mark]
c) If 100 mL of acetylsalicylic acid sample is titrated with 100 mL of 0.1 M NaOH, what is the pH of this mixture at equivalence point? [3 Marks]
Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. It is a colourless liquid with a pungent odour. A quantity of 5.75 g of SO2Cl2 was placed in a 3.00 L flask. At 375 °C, there is 0.035 mole of Cl2 present. SO2Cl2(g) SO2(g) + Cl2(g)
a) Calculate Kc for the reaction. [10 marks]
b) What is the value of Kp? [4 marks]
c) Predict the directions of the shift in equilibrium when
i. Some Cl2 gas is removed from the mixture
ii. More SO2 gas is added to the reaction mixture
iii. The pressure on the gases is increased [6 marks]
25.0cm3 of 0.200mol dm-3 sodium hydroxide reacted with 28.7 cm3 of sulphuric acid, calculate the concentration of the sulphuric acid. with calculations
Thank you
what volume of 0.100 mol dm-3 hydrochloric acid would react with 25g of calcium carbonate, with calculations.
Oxidation of sulphur to H2S
Which one is correct:-
Q-Pyrrole is heterocyclic aromatic compound :
a. Hexacyclic contain one nitrogen
b. pentacyclic contain one nitrogen
An aqueous solution of NaOH can dissolve an aluminum sheet in the reaction: 2 Al+ 2 NaOH+ 2 H2O > 2 NaAlO2 + 3 H2
