"Removal of Insoluble Impurities in Coarse Salt" Salt Fertilizer PPT Courseware 4

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"Removal of Insoluble Impurities in Coarse Salt" Salt Fertilizer PPT Courseware 4

Removal of insoluble impurities in coarse salt

Steps: ① Dissolve, ② Filter, ③ Evaporate, ④ Calculate yield

1. Dissolve [Weigh (code left and right)]

Instruments: pallet balance, medicine spoon, beaker, glass rod, measuring cylinder

The function of the glass rod: stirring, accelerating dissolution

2. Filter

Instruments: iron stand (with iron ring), funnel, beaker, glass rod

Operation: one stick, two low, three lean

One stick: The filter paper sticks to the inner wall of the funnel.

Second low: the edge of the filter paper is lower than the funnel mouth; the liquid level is lower than the edge of the filter paper.

Three supports: The mouth of the beaker is against the glass rod; the end of the glass rod is gently leaning against the side of the three-layer filter paper; the lower end of the funnel is against the inner wall of the beaker.

(2012 Binzhou) (1) A student followed the steps shown in the figure: the wrong step is ________ (fill in the alphabetical number); the name of the instrument in B is ______; the function of the glass rod in E is ______ .

(2) If the mass of the weight in A in the above picture is 5g and the weight is 2.5g, then the mass of sodium chloride measured by Xiao Ming is actually ______.

(2012 Qingdao) Question 2: How to remove soluble impurities during the purification process of crude salt?

Coarse salt contains impurities such as sodium sulfate and calcium chloride. When purifying, first add an excess of barium hydroxide solution to the crude brine in order to completely remove ______________; add an excess of ____________ solution to remove impurity cations; filter out the precipitate, add ______________ to the filtrate, and dissolve the solution The pH is adjusted to 7 to obtain refined brine.

(2012•Taian) Recrystallized salt often contains a small amount of sodium sulfate, magnesium chloride, calcium chloride and other impurities. They mainly exist in the form of SO2�4, Ca2+, Mg2+ in the solution. In order to remove these impurities , you can add excess sodium hydroxide, sodium carbonate, and barium chloride solution to the salt solution, then add hydrochloric acid to adjust the solution pH=7, and finally filter and evaporate to obtain refined salt. Which of the following operations and solutions are added in the wrong order? ()

A． BaCl2, NaOH, Na2CO3, filter, HCl

B． BaCl2, Na2CO3, NaOH, filter, HCl

C. NaOH, BaCl2, Na2CO3, filter, HCl

D. Na2CO3, BaCl2, NaOH, filter, HCl

(2012•Jining) Coarse salt obtained from seawater often contains soluble impurities (mainly salt) and insoluble impurities (sand, etc.), which must be separated and purified before it can be used in industrial production and people's daily life. Part of the process of purifying coarse salt is as follows:

Among them, three steps are required between filtrate one and filtrate two:

Operation 1: Add excess sodium carbonate to remove Ca2+ in the filtrate

Operation 2: Add excess X to remove Mg2+ in the filtrate

Operation 3: Add excess barium chloride to remove SO42 in the filtrate.

Please answer: (1) The substance

(2) The purpose of adding an appropriate amount of dilute hydrochloric acid to filtrate 2 is to ____________________

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For more information about the PPT courseware "Removal of Insoluble Impurities in Coarse Salt of Salt Chemical Fertilizer", please click on the Removal of Insoluble Impurities in Coarse Salt of Salt Chemical Fertilizer ppt ppt tag.

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Update Time: 2024-12-05

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