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What is the enthalpy change when 40.1 ml of 0.400 M sulfuric acid reacts with 19.5 ml of 0.133 M potassium hydroxide?
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∙ 11y ago
-0.145 kj
Wiki User
∙ 11y ago
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Is there any colour change when sulfuric acid is mixed with sodium hydroxide?
Any colour change.
Why is it difficult to determine the enthalpy change of thermal decomposition of potassium hydrogencarbonate to potassium carbonate?
The reaction which forms potassium hydrogen carbonate from potassium carbonate, K2CO3 + H2O + CO2 --> KHCO3 is difficult to perform in a laboratory; the same goes for the decomposition. Hence instead of simply using a calorimeter or similar apparatus, it is necessary to use another reaction route and a Hess Cycle using two reactions such as: reaction A: K2CO3 + 2HCl --> 2KCL + H2O +CO2 reaction B: KHCO3 + 2HCl --> KCl + H2O +CO2 The enthalpy change of the decomposition of potassium hydrogen carbonate will be twice the enthalpy change for reaction B, minus the enthalpy change for reaction A.
Why can't potassium hydroxide be used to test for carbon dioxide?
it is because potassium hydroxide will react with carbon dioxide to form potassium carbonate and water. but potassium carbonate is soluble, so there will be no visible change to see if there is carbon dioxide emitted
Would the enthalpy change be different if solid sodium hydroxide pellets were added to hydrochloric acid instead of adding hydrochloric acid to sodium hydroxide solution?
Yes, the reaction involving the solid is actually an individual step in the equation of the reaction between the solutions. If you were to add the change in enthalpy of the reaction with the solid NaOh to the change in enthalpy of the other step in the reaction (that's adding water and the NaOh pellets) you would find the sum equivalent to the change in enthalpy of the reaction involving the two solutions (this is supported by Hess's law). I suggest that you consider Hess's law for more information.
Is hydrochloric acid reacts with potassium hydroxide to produce a saltwater and heat a physical or chemical change?
Chemical Change
Is there any colour change when sulfuric acid is mixed with sodium hydroxide?
Any colour change.
Why is it difficult to determine the enthalpy change of thermal decomposition of potassium hydrogencarbonate to potassium carbonate?
The reaction which forms potassium hydrogen carbonate from potassium carbonate, K2CO3 + H2O + CO2 --> KHCO3 is difficult to perform in a laboratory; the same goes for the decomposition. Hence instead of simply using a calorimeter or similar apparatus, it is necessary to use another reaction route and a Hess Cycle using two reactions such as: reaction A: K2CO3 + 2HCl --> 2KCL + H2O +CO2 reaction B: KHCO3 + 2HCl --> KCl + H2O +CO2 The enthalpy change of the decomposition of potassium hydrogen carbonate will be twice the enthalpy change for reaction B, minus the enthalpy change for reaction A.
Why can't potassium hydroxide be used to test for carbon dioxide?
it is because potassium hydroxide will react with carbon dioxide to form potassium carbonate and water. but potassium carbonate is soluble, so there will be no visible change to see if there is carbon dioxide emitted
Is hydrochloric acid reacts with potassium hydroxide to produce a saltwater and heat a physical or chemical change?
Chemical Change
Would the enthalpy change be different if solid sodium hydroxide pellets were added to hydrochloric acid instead of adding hydrochloric acid to sodium hydroxide solution?
Yes, the reaction involving the solid is actually an individual step in the equation of the reaction between the solutions. If you were to add the change in enthalpy of the reaction with the solid NaOh to the change in enthalpy of the other step in the reaction (that's adding water and the NaOh pellets) you would find the sum equivalent to the change in enthalpy of the reaction involving the two solutions (this is supported by Hess's law). I suggest that you consider Hess's law for more information.
What is relation between hydration energy lattice energy and enthalpy of solution?
enthalpy change of solution=enthalpy change of hydration - enthalpy change of lattice
Definition for standard enthalpy change of neutralization?
Enthalpy change of neutralisation is defined as the enthalpy change of a reaction where one mole of hydrogen ions reacts with one mole of hydroxide ions to form one mole of water under standard conditions of 1 atm, 298K (25 degree Celsius) and in the solutions containing 1 mol per dm3.
When hydrochloric acid is mixed with potassium hydroxide is it a chemical change?
Yes - you have an acid and base and the resultant products are a salt (Potassium Chloride) and water
Does potassium change a different colour when mixed with water?
It can be argued it does as Potassium is a silvery gray metal. When reacted with water it produces colorless Potassium Hydroxide and colorless hydrogen gas.
What is the difference between enthalpy change and enthalpy change per mole?
Enthalpy is the energy absorbed or lost from a reaction, but enthalpy change per mole is the amount of energy lost per mole, so in order to get the overall enthalpy from the change per mole, you must multiply that value by the amount of moles used in the reaction.
How does the presence of a catalyst affect the enthalpy change of a reaction?
The presence of a catalyst affect the enthalpy change of a reaction is that catalysts do not alter the enthalpy change of a reaction. Catalysts only change the activation energy which starts the reaction.
What happen if the potassium permanganate solution drop to the water and add of concentrated sulfuric acid?
It will change colour and become purple
