4. 9 g a tribasic acid was dissolved in water and the solution made up to 500cm³. If the molarity of the hydrogen ions in...

4. 9 g a tribasic acid was dissolved in water and the solution made up to 500cm³. If the molarity of the hydrogen ions in the solution is 0.3 molar calculate the relative molecular mass of the acid.

---

---

Kavungya answered the question on March 28, 2019 at 13:44

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• The diagram below represents pipes used in Frasch pump for the extraction of sulpur Name the substance that pass through the following tubes and the direction... (Solved)
  

  The diagram below represents pipes used in Frasch pump for the extraction of sulpur
  
  
  Name the substance that pass through the following tubes and the direction which they flow.
  1.
  2.
  3.

  Date posted: March 28, 2019 .    Answers (1)

• 12.0 cm³ of methane and 48cm³ of oxygen were exploded together. The final volume measured under the original conditions was 36.0 cm³ neglecting the water... (Solved)
  

  12.0 cm³ of methane and 48cm³ of oxygen were exploded together. The final volume measured under the original conditions was 36.0 cm³ neglecting the water formed. 24.0cm³ of this was unused oxygen. Show the ratio of reacting volume of the gases referred to and gaseous products formed.

  Date posted: March 28, 2019 .    Answers (1)

• The molecular formula of compound T is C₃H₈O. T reacts with acidified potassium manganate (VII) to form another compound U whose formula C₃H₆O₂. T also... (Solved)
  

  The molecular formula of compound T is C₃H₈O. T reacts with acidified potassium manganate (VII) to form another compound U whose formula C₃H₆O₂. T also reacts with sodium metal to produce hydrogen gas and T is neutral to litmus.
  (a) Suggest the homologous series to which T belongs.
  (b) Name the type of reaction leading to the formation of U in the reaction described above.
  (c) Write the structural formula of U.

  Date posted: March 28, 2019 .    Answers (1)

• Element X contains isotopes with mass number 16 and 18 respectively existing in the ratio 1: 3. Calculate the relative atomic mass of X. (Solved)
  

  Element X contains isotopes with mass number 16 and 18 respectively existing in the ratio
  1: 3. Calculate the relative atomic mass of X.

  Date posted: March 28, 2019 .    Answers (1)

• What volume of methane would remain if a burner containing 40cm³ of methane burns in 40cm³ of enclosed air (assuming that oxygen is 20% of air)? (Solved)
  

  What volume of methane would remain if a burner containing 40cm³ of methane burns in 40cm³ of enclosed air
  (assuming that oxygen is 20% of air)?

  Date posted: March 28, 2019 .    Answers (1)

• Two samples of a similar substance from different containers were investigated. The curve below represents the variation of temperature with time when heated separately. a) Explain... (Solved)
  

  Two samples of a similar substance from different containers were investigated. The curve below represents the variation of temperature with time when heated separately.
  
  
  a) Explain the variation in the curves.
  Sample I
  Sample II
  b) Common salt is sprinkled on roads during winter in temperate countries.

  Date posted: March 28, 2019 .    Answers (1)

• A compound has empirical formula C₃H₆O and relative formula mass of 116. Determine it’s molecular formula.(C = 12, H = 1, O = 16). (Solved)
  

  A compound has empirical formula C₃H₆O and relative formula mass of 116. Determine it’s molecular formula.(C = 12, H = 1, O = 16).

  Date posted: March 28, 2019 .    Answers (1)

• Explain why it is not advisable to use potassium chloride as salt bridge in the cell shown below. (Solved)
  

  Explain why it is not advisable to use potassium chloride as salt bridge in the cell shown below.
  
  

  Date posted: March 28, 2019 .    Answers (1)

• When bromine gas reacts with aqueous sodium hydroxide an equilibrium is established as shown below. (Solved)
  

  When bromine gas reacts with aqueous sodium hydroxide an equilibrium is established as shown below.
  
  What observation would be made if a few drops of dilute sulphuric (VI) were added to the equilibrium mixture? Explain.

  Date posted: March 28, 2019 .    Answers (1)

• Butane burns in air according to the equation shown below. 2C₄H₁₀(g) + 13O₂(g) ----> 8CO₂(g) + 10H₂O(l) What volume of butane must be burnt in oxygen to... (Solved)
  

  Butane burns in air according to the equation shown below.
  2C₄H₁₀(g) + 13O₂(g) ----> 8CO₂(g) + 10H₂O(l)
  What volume of butane must be burnt in oxygen to give 11g of CO₂ at r.t.p?
  (Molar gas volume at r.t.p = 24.0L; C = 120; O = 16.0; H = 1.0 )

  Date posted: March 28, 2019 .    Answers (1)

• Study the cycle below hence answer the questions that follow. (Solved)
  

  Study the cycle below hence answer the questions that follow.
  
  (a) What is (change)H₃?
  (b) Show the relationship connecting (change)H₁,(change)H₂ and (change)H₃

  Date posted: March 28, 2019 .    Answers (1)

• In an experiment soap solution was used against 3 separate samples of water. Each sample was later boiled and soap added. Each water sample was... (Solved)
  

  In an experiment soap solution was used against 3 separate samples of water. Each sample was later boiled and soap added.Each water sample was 1000cm³. The results are tabulated below.
  
  (a) Which sample was likely to be soft water? Explain.
  (b) State the cause of change in volume of soap used to form lather in sample III.

  Date posted: March 28, 2019 .    Answers (1)

• The scheme below shows some reaction of salt. Study it and answer questions that follow. (Solved)
  

  The scheme below shows some reaction of salt. Study it and answer questions that follow.
  
  (i) Write an equation for the reaction to show formation of gas P and solid X.
  (ii) Give the name and formula of the complex ion responsible for the deep blue colour in the solution.

  Date posted: March 28, 2019 .    Answers (1)

• Excess carbon II Oxide was passed over heated sample of an oxide of iron. The following results were obtained. Determine the empirical formular of the iron... (Solved)
  

  Excess carbon II Oxide was passed over heated sample of an oxide of iron. The following
  results were obtained. Determine the empirical formular of the iron oxide.
  Mass of empty dish = 10.98g
  Mass of empty dish + oxide of iron = 13.30g
  Mass of dish + residue = 12.66g
  (Fe = 56; C = 12; O = 16 )

  Date posted: March 28, 2019 .    Answers (1)

• Explain why potassium chloride conducts electricity in both the molten state and in aqueous solution whereas hydrogen chloride conducts electricity only in aqueous solution and... (Solved)
  

  Explain why potassium chloride conducts electricity in both the molten state and in aqueous solution whereas hydrogen chloride conducts electricity only in aqueous solution and not in gaseous state.

  Date posted: March 28, 2019 .    Answers (1)

• A certain substance has a boiling point of 1680⁰C. It does not conduct electricity when in solid form but conducts when molten. What is the... (Solved)
  

  A certain substance has a boiling point of 1680⁰C. It does not conduct electricity when in solid form but conducts when molten. What is the most likely structure of the substance? Explain.

  Date posted: March 28, 2019 .    Answers (1)

• Study the diagrams below. (Solved)
  

  Study the diagrams below.
  
  (a) State the observations made at I and II.
  (b) Write the equation to show the reactions at II if dry sulphur (IV) oxide was used in place of dry chlorine.

  Date posted: March 28, 2019 .    Answers (1)

• The table below shows elements W, X, Y and Z and their atomic numbers. The letters are not the actual symbols of the elements. Use... (Solved)
  

  The table below shows elements W, X, Y and Z and their atomic numbers. The letters are not the actual symbols of the elements. Use the letters to answer the questions that follow.
  
  
  (a) Select an element which forms
  (i) Anions.
  (ii) An insoluble carbonate
  (b) Which element has the largest atomic radius

  Date posted: March 28, 2019 .    Answers (1)

• Briefly explain the following (a) Atomic radii of alkaline earth metals are smaller than those of the corresponding alkali metals in the same period. (b) Melting point... (Solved)
  

  Briefly explain the following
  (a) Atomic radii of alkaline earth metals are smaller than those of the corresponding alkali metals in the same period.
  (b) Melting point of halogens increase down the group.
  (c) Helium is a better gas for use in weather research balloons than hydrogen.

  Date posted: March 28, 2019 .    Answers (1)

• An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 62.35 and 70.45, calculate the relative... (Solved)
  

  An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 62.35 and 70.45, calculate the relative abundance of each of the isotopes.

  Date posted: March 28, 2019 .    Answers (1)