Why do we have to weight the beaker with salt and water before dissolving the Nacl ? why is it incorrect to weight it after we dissolve it
I suppose you meant "weigh".
I can't answer because I don't know what you're doing.
The reason we need to weigh the beaker with salt and water before dissolving NaCl (sodium chloride) is to accurately determine the amount of salt we are adding to the solution. This is important for conducting experiments or preparing solutions with precise concentrations.
When we weigh the beaker with salt and water before dissolving the NaCl, we measure the combined weight of the beaker, salt, and water. By subtracting the weight of the empty beaker, we can determine the weight of the salt added.
On the other hand, weighing the beaker after dissolving the NaCl can result in inaccurate measurements. When we dissolve NaCl in water, the salt molecules disperse throughout the solution, making it difficult to accurately measure the weight of the dissolved salt. Additionally, some of the solution may evaporate or splash out during the process, further affecting the accuracy of the measurement.
Therefore, it is recommended to weigh the beaker with salt and water before dissolving NaCl to ensure accurate measurement of the amount of salt added to the solution.