Task 3: Explain standard solutions and at least 3 different types of titrations that are used in industry and compare these to titrations in the lab.
Standard Solutions & Titrations
A standard solution is a solution of a known concentration. Standard solutions are made by dissolving an accurately weighed mass of a solid in a known volume of a soluble solvent using a volumetric flask.
Method
• Firstly, you would need to calculate the mass of the NaOH that you are going use.
• Next you accurately weigh out the NaOH (to 2d.p) in a weighing boat using a weighing machine. You should record down the final mass.
• Now you transfer the NaOH to a small beaker. To make sure all the particles are transferred to the beaker you rinse the weighing boat …show more content…
• Using a funnel, you then transfer the solution from the beaker and into the volumetric flask. To make sure all the particles are transferred you rinse the beaker and funnel into the volumetric flask.
• You then add distilled water until the water level is close to the mark (100cm3). To make sure the distilled water is touching the bottom of the meniscus, you can use a pipette to add tiny drops.
• The lid should then be placed as now you have to shake the solution well to dissolve the tiny particles of NaOH in the flask. The standard solution is ready to be used now.
• At this stage you can find out the exact concentration of the standard solution from its actual mass of NaOH …show more content…
Direct titration method is a single step process. Substance is directly titrated with titrant by using simple indicator. Example: titration of strong acid (HCl) with strong base, which is usually the reactant (NaOH).
2. Indirect titration method is a two-step process. This is a titration method where the concentration of an analyte is determined by reacting it with a known amount of additional substance. The remaining additional substance is then titrated with another second substance. The second titration's results show how much of the additional substance was used in the first titration and the original analyte's concentration can then be calculated.
3. Back titration method is a three-step process. The purpose of back titrating is to return to the endpoint after it was conceded. Back titrating should only be used when it is. It is often used when the solution which is being titrated is either too weak or too slow to give a reaction. It is also used if too much titrant was added, and the solution turned too dark. This means the experiment must be done over. The way to back titrate is to add an additional volume of another reactant of known concentration (Standard
Standard Solutions & Titrations
A standard solution is a solution of a known concentration. Standard solutions are made by dissolving an accurately weighed mass of a solid in a known volume of a soluble solvent using a volumetric flask.
Method
• Firstly, you would need to calculate the mass of the NaOH that you are going use.
• Next you accurately weigh out the NaOH (to 2d.p) in a weighing boat using a weighing machine. You should record down the final mass.
• Now you transfer the NaOH to a small beaker. To make sure all the particles are transferred to the beaker you rinse the weighing boat …show more content…
• Using a funnel, you then transfer the solution from the beaker and into the volumetric flask. To make sure all the particles are transferred you rinse the beaker and funnel into the volumetric flask.
• You then add distilled water until the water level is close to the mark (100cm3). To make sure the distilled water is touching the bottom of the meniscus, you can use a pipette to add tiny drops.
• The lid should then be placed as now you have to shake the solution well to dissolve the tiny particles of NaOH in the flask. The standard solution is ready to be used now.
• At this stage you can find out the exact concentration of the standard solution from its actual mass of NaOH …show more content…
Direct titration method is a single step process. Substance is directly titrated with titrant by using simple indicator. Example: titration of strong acid (HCl) with strong base, which is usually the reactant (NaOH).
2. Indirect titration method is a two-step process. This is a titration method where the concentration of an analyte is determined by reacting it with a known amount of additional substance. The remaining additional substance is then titrated with another second substance. The second titration's results show how much of the additional substance was used in the first titration and the original analyte's concentration can then be calculated.
3. Back titration method is a three-step process. The purpose of back titrating is to return to the endpoint after it was conceded. Back titrating should only be used when it is. It is often used when the solution which is being titrated is either too weak or too slow to give a reaction. It is also used if too much titrant was added, and the solution turned too dark. This means the experiment must be done over. The way to back titrate is to add an additional volume of another reactant of known concentration (Standard