Solutions, Dilutions and molarity calculations

wherefore is a conical flask, rather than a beaker, use in the experiment? To allow easy mixing of solutions by swirling. 2. why is the funnel removed from the burette after adding the blistering solution? so that the drops from the funnel will not fall into the burette. 3. In using a burette, why is it important to (a) rinse it with a little of the solution it is discharge to contain? to remove any residual water and so nullify dilution of the acid solution when it is poured into the burette. (b) to clamp it vertically? to enable the liquid take aim to be read correctly. ) to have the part below the tap salutary? to vouch that the actual volume of liquid delivered into the flask is read correctly. 4. blow over one reason for carrying come out of the closet the following procedures during the titration. (i) The sides of the conical flask were serve down with deionised water? To ensure that all of the acid added from the burette shadower react with the base. (ii) The conical flask was frequently swirled or shaken? To ensure complete mixing of the reactants. 5. Why is a rough titration carried out? To catch the approximate end point.This nformation enables the subsequent titrations to be carried out more quickly. 6. Why is more than one accurate titration carried out? To minimise error by getting accurate readings within 0. 1-3 cm of each other. 7. apologize why hydrochloric acid is not used as a primary hear? The exact concentration of any hydrochloric acid solution is not known, unless it is fain from standard ampoules. Laboratory grade hydrochloric acid is not sufficiently pure. 8. thunder mug any of the following be used as primary standards NaOH, H2S04, HN03? Explain your answer.A primary standard should be available in a exceedingly pure state and stable. None of these substances are available pure because (a) NaOH readily absorbs water and carbon dioxide from the air. (b) Concentrated H2S04 readily absorbs water from the air. (c)HN03 breaks down let go of N02 gas. 9. If you used only 10cm3 of sodium carbonate solution in the conical flask, calculate how much acid would be required to neutralise it. x 10-3 moles Na2C03 10cm3 Na 2CO 3 solution used at concentration of 0. 1 M 1 2 x 10-3 moles HCL required Concentration of HCL is 0. M 1000 x 2 x 10-3 / 0. 23crn3 required = 10. 5crn fi13. 10. Describe briefly how a pure dry sample of sodium chloride could be obtained having carried out the titration? Using the information provided by the titration results, add Just enough hydrochloric acid to exactly neutralise 25cm 3 of sodium carbonate. The indicator should not be added. Gently heat the solution until all the water has evaporated to dryness. A sample of sodium chloride will remain in the beaker. Solutions, Dilutions and molarity calculations By AbigailHerbert