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Making a standard solution

Making a standard solution

Making a standard solution
Search this site. Navigation Home. Contents 1 Syllabus 1. Weighing the solute 2. Homogenising the solution. In Analytical Chemistry a titration is a used to find information about the concentration or purity of another substance. In general it follows a 5 steps. Weighing the solute Clearly there is no point beginning to make a standard solution unless the solute you are about to dissolve is pure. Generally the solute is weighed on a plastic weighing boat. This takes into account any solute that sticks to the weighing boat. The solute is transferred to a beaker because they are easy to stir. The solute is dissolved in a small volume of distilled water. This ensures that you are not adding any unaccounted for substances from tap water. All the solute must dissolve or the concentration will be incorrect. If it does not then add a little more distilled water. Any solute that sticks to the sides of the beaker or to the glass rod can be dealt with providing that the volume of water we use is less than the volumetric flask it will be transferred to. A volumetric flask is a piece of glassware on which you'll find an engraved mark. Making the solution up to this mark is more accurate than using a measuring cylinder. However, it is important to wash the stirring rod you used into you beaker with more distilled water. Then to wash the beaker into the flask. This ensures that all the dissolved solute is in the flask. If a funnel is used for this then the funnel must also be thoroughly washed. Finally the flask is carefully made up to the mark so that the bottom of the meniscus touches the line as shown. Currently most of the dissolved solute is in the bottom of the flask. The top is mostly filled with the distilled water you made up the solution with at the end. The concentration is not homogeneous - it is inconsistent from bottom to top. This is no use for a titration. You could wait for diffusion to equalise everything if you have a few days! Carrying out a Titration. We will need a standard solution of an acid - say, Hydrochloric Acid HCl.

Standard solution example

You will need to weigh accurately a sample of potassium hydrogenphthalate and use it to make a solution of concentration close to 0. What effect would each of the errors described below have on the concentration of potassium hydrogenphthalate? Aim The purpose of this experiment is to prepare a standard solution of potassium hydrogenphthalate. Introduction Potassium hydrogenphthalate, is a primary standard because it meets certain requirements. It must be available in a highly pure state. It must be stable in air. It must be easily soluble in water. It should have a high molar mass. In solution, when used in volumetric analysis, it must undergo complete and rapid reaction. Put about 50 cm 3 of water into a cm 3 beaker. Carefully transfer the bulk of the potassiumhydrogen phthalate from the weighing boat into the beaker. Reweigh the boat with any remaining potassium hydrogen phthalate to the nearest 0. Stir to dissolve the solid, adding more water if necessary. Transfer the solution to the volumetric flask through the filter funnel. Rinse the beaker well, making sure all liquid goes into the volumetric flask. Add distilled water until the level is within about 1 cm of the mark on the neck of the flask. Insert the stopper and shake to mix the contents. Using the dropping pipette, add enough water to bring the bottom of the meniscus to the mark. Insert the stopper and shake thoroughly ten times to ensure complete mixing. Simply inverting the flask once or twice does not mix the contents properly and is a very common fault. Label the flask with the contents, your name and the date. Leave a space for the concentration to be filled in after you have calculated it. This can now be used to calculate the unknown concentration of a base. Share this: Twitter Facebook. Like this: Like Loading Widgets Advertisements.

Preparation of standard solution calculations

Sodium hydroxide is a common and useful strong base. Special care is required to prepare a solution of sodium hydroxide or NaOH in water because considerable heat is liberated by the exothermic reaction. The solution may splatter or boil. Here is how to make a sodium hydroxide solution safely, along with recipes for several common concentrations of NaOH solution. Prepare solutions of sodium hydroxide using this handy reference table which lists the amount of solute solid NaOH that is used to make 1 L of base solution. Follow these lab safety guidelines:. To prepare these recipes, start with 1 liter of water and slowly stir in the solid NaOH. A magnetic stir bar is helpful if you have one. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Updated February 06, Don't touch sodium hydroxide! It is caustic and could cause chemical burns. Another option is to neutralize any base on the skin with a weak acid, such as vinegar, and then rinse with water. Stir the sodium hydroxide, a little at a time, into a large volume of water and then dilute the solution to make one liter. Add sodium hydroxide to water— do not add water to solid sodium hydroxide.

How to make a standard solution for titration

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Preparation of standard solution pdf

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How to make a standard solution a level chemistry

Making a standard solution
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How to prepare standard solution of hcl

Making a standard solution
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Preparation of standard solution lab report

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Secondary standard solution

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