A volumetric flask is used to measure very precisely one specific volume of liquid (100 mL, 250 mL, etc., depending on which flask you use). This flask is used to accurately prepare a solution of known concentration.
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What is the purpose of a volumetric flask?
Volumetric flasks are calibrated with great accuracy, for the purpose of preparing dilutions and solutions of a precise volume.
What is the purpose of a flask in chemistry?
Flasks can be used for making solutions or for holding, containing, collecting, or sometimes volumetrically measuring chemicals, samples, solutions, etc. for chemical reactions or other processes such as mixing, heating, cooling, dissolving, precipitation, boiling (as in distillation), or analysis.
How does a volumetric flask measure volume?
All volumetric glassware is calibrated with markings used to determine a specific volume of liquid to varying degrees of accuracy. To read this volume exactly, the bottom of the curved surface of the liquid, the meniscus, should be located at the scribed line for the desired volume.
Why do we use a volumetric flask quizlet?
A volumetric flask is used to measure precise liquids when you make a Molar solution.
How is a solution made in a volumetric flask?
Fill the volumetric flask approximately two thirds full and mix. Carefully fill the flask to the mark etched on the neck of the flask. Use a wash bottle or medicine dropper if necessary. Mix the solution thoroughly by stoppering the flask securely and inverting it ten to twelve times.
Why is standard solution prepared in volumetric flask?
Why is the standard solution always prepared in a volumetric flask? Answer. A volumetric flask is used when it is necessary to know the volume of the solution being prepared precisely and accurately. Volumetric flasks have been calibrated (standardised) to specific volumes.
How is a volumetric flask used to prepare a solution with a known concentration?
The first step in preparing a solution of known molar concentration is to weigh a solute accurately and then transfer it to a volumetric flask of a desired volume. Next, water is added to the flask, which is then swirled to dissolve the solid.
Why is the volumetric flask the most accurate?
Although convenient and less time-consuming to use, graduated cylinders are considered to lack precision due to their large meniscus when compared to pipettes. The long, narrow, and slender neck of the volumetric pipette makes it easier to measure and read the meniscus very precisely.
What is the function of flask types?
Flasks are useful types of chemistry glassware for containing liquid and performing mixing, heating, cooling, precipitation, condensation, and other processes.
When using a volumetric flask Why do we have to fill it exactly on the given mark?
Overfilling the flask above the graduation mark ruins the volume measurement. In this case, the content inside the volumetric flask should be discarded. A pipette bulb should be used to withdraw and deliver liquids when using a pipette.
How do you find the volume of a liquid in a flask?
The density of a pure substance is equal to its mass divided by its volume: Density = mass volume or volume = mass density. The volume of the flask is equal to the volume of the water it contains. Since we know the mass and density of the water, we can find its volume and that of the flask.
How do you measure a liquid in chemistry?
The volume of a liquid can be directly measured with specialized glassware, typically in units of milliliters (mL) or liters (L). In this lab, a beaker, two graduated cylinders and a burette will be used to measure liquid volumes, and their precision will be compared.
How do you use volumetric?
When you are in the lab what do you have to do if there is an unexpected violent chemical reaction in a bottle?
what should you do if there is an unexpected violence chemical reaction in a bottle. So first of all, if it’s a violent reaction, first thing you want to do is back up and inform people around you and as you back up, make sure you look behind you, make sure you’re not going to knock into somebody else.
Which glassware is best used in preparing standard solutions quizlet?
A volumetric flask (measuring flask or graduated flask) is a piece of laboratory glassware, a type of laboratory flask, calibrated to contain a precise volume at a particular temperature. Volumetric flasks are used for precise dilutions and preparation of standard solutions.
What is the first thing you have to do if there is a fire in the lab?
should always pull the fire alarm and call 911 to evacuate the building and bring the fire department. ➢ Keep areas around all types of heating equipment clear of combustibles at all times. While working in a lab you notice that smoke is coming from a fume hood across the room.
How do you dilute a solution using a volumetric flask?
How do you determine concentration?
Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution.
Can you dissolve solid in a volumetric flask?
To make up a solution in a volumetric flask: Add solvent to below the neck portion of the flask to dissolve the solid. If you shake the flask to help dissolve the solid, make sure the stopper is in place. After the solid is completely dissolved, very carefully fill the flask to the mark.
What is the most accurate measuring device in chemistry?
Volumetric flasks, burettes, and pipettes made for measuring small amounts of liquid are the most accurate, with tolerances of less than ±0.02.
Why use a volumetric flask vs a graduated cylinder?
A volumetric flask should be used whenever an accurate concentration of solution is required. Graduated Cylinders are volumetric measuring devices designed to measure and deliver accurate volumes of liquids.
What does a volumetric flask look like?
A volumetric flask is a flat bottomed bulb with a elongated neck calibrated to hold a set volume at a mark on the neck. The flask may also be called a graduated flask or measuring flask because its mark specifies a precise volume measurement. The mark on the flask neck indicates the volume contained.
How accurate is a volumetric flask?
The volumetric flask had the lowest percent error (0.3%), so it is the most accurate. The graduated cylinder and beaker were similar in percent error (2.2% and 3.5% respectively). Both were small, so they are fairly accurate.
How do you measure volume of a solution?
