Why did you use a volumetric pipet for the addition of Na_2CO_3, but were able t

Question

Why did you use a volumetric pipet for the addition of Na_2CO_3, but were able to use a graduated cylinder for the addition of CaCl_2? Sodium carbonate-also called washing soda-can be used as a water softener. Hard water occurs mainly from the presence of Ca^2+ (and to a lesser extent, Mg^2+) ions in the water. How does sodium carbonate soften hard water? The Artesian Water Company is the public water utility in the state of Delaware. In 2015 they reported a maximum of 228 ppm Ca^2+ in their water. Convert this concentration from ppm to M. If you wanted to soften 10.0 L of water from the Artesian water company, how many mL of your assigned Na_2CO_3 solution would you need to add to remove all reported Ca^2+ ions?

Explanation / Answer

Ans 4

Volumetric pipett allows extreme accurate measurement of the substance upto 4 significant figures whereas graduated cylinder is a common piece in laboratory used to measure solutions with large amounts and less precisely.

Ma2CO3 was used in less quantity and the accurate measurement of its quantity affected the experiment result and conclusions so pipette was used for it and cylinder for CaCl2.

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