10 The concentration of dilute sulfuric acid can be determined by titration with sodium hydroxide solution of known concentration. 25.00cm' of dilute sulfuric acid was measured out using a pipette and transferred to a conical flask. A few drops of methyl orange indicator were added to the acid in the conical flask Sodium hydroxide solution was added to the acid from a burette until the indicator changed colour. The titration was repeated until two concordant results were obtained. The accurate result was the average of the two concordant results. (a) Describe the colour change seen at the end point of the titration. from to (b) A brief report of the practical method has been given above. Further detail can be added to this method to ensure that anyone following the method will obtain an accurate result. Explain two details that could be added to this practical method to ensure an accurate result is obtained.

Question

10 The concentration of dilute sulfuric acid can be determined by titration with sodium hydroxide solution of known concentration. 25.00cm' of dilute sulfuric acid was measured out using a pipette and transferred to a conical flask. A few drops of methyl orange indicator were added to the acid in the conical flask Sodium hydroxide solution was added to the acid from a burette until the indicator changed colour. The titration was repeated until two concordant results were obtained. The accurate result was the average of the two concordant results. (a) Describe the colour change seen at the end point of the titration. from to (b) A brief report of the practical method has been given above. Further detail can be added to this method to ensure that anyone following the method will obtain an accurate result. Explain two details that could be added to this practical method to ensure an accurate result is obtained.

Answer 1

(a) The color change seen at the end point of the titration is from red to yellow.(b) Two details that could be added to this practical method to ensure an accurate result is obtained are:1. Ensuring that the burette is filled accurately to the 0.00 cm³ mark at the start of the titration and that the final volume is recorded accurately.2. Repeating the titration several times and taking the average of the concordant results to minimize random errors.

Answer 2

## Step1: The question is asking for two different things. Part (a) is asking for the color change seen at the end point of the titration. Part (b) is asking for two details that could be added to this practical method to ensure an accurate result is obtained.## Step2: For part (a), the color change at the end point of the titration using methyl orange as an indicator is from red in acid to yellow in alkali. ## Step3: For part (b), there are several ways to ensure an accurate result in a titration experiment. Two of them could be:1. Ensuring that the burette is filled accurately to the 0.00 cm³ mark at the start of the titration and that the final volume is recorded accurately. This can be done by reading the volume at eye level and using a meniscus to read the volume.2. Repeating the titration several times and taking the average of the concordant results (results that are within 0.10 cm³ of each other) to minimize random errors.

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