"Configuration of Sodium Chloride Solution with Certain Solute Mass Fraction" Solution PPT Courseware 3

Description

"Configuration of Sodium Chloride Solution with Certain Solute Mass Fraction" Solution PPT Courseware 3

learning target

1. Simple calculations related to solute mass fractions are performed.

2. A solution with a certain solute mass fraction will be prepared.

Key points and difficulties

Focus: Operation steps for preparing solutions and specifications for basic experimental operations

Difficulty: Error analysis of this experiment

Step One: Orientation Guide

Step Two: Interactive Discussion

1. What two parts does the solution consist of?

solute solvent

2. What are the basic steps for preparing a solution?

Calculate, weigh, dissolve, bottle and store

3. Summarize the experimental supplies for this experiment according to the operating steps.

Pallet balance, measuring cylinder, plastic tip dropper, medicine spoon,

Glass rod, beaker, sodium chloride, water

4. How to prepare 35 grams of sodium chloride solution with a concentration of 16%.

experiment procedure:

1. Purpose: Use salt and water to prepare 35g of 16% seed selection solution

2. Operation steps:

(1) Calculation: Calculate the mass of the required solute sodium chloride as _____g and the volume of water as _____ml.

Preparing 35g of 16% seed selection solution with salt and water requires:

Mass of table salt: 35g×16%=5.6g

Volume of water: (35g-5.6g) ÷1g/mL=29.4mL

(2) Weighing: Use _______ to weigh the mass of sodium chloride, and use _______ to measure the volume of water.

(3) Dissolution: Pour the weighed sodium chloride and measured amount of water into the beaker _______, stir with a glass rod to completely dissolve.

(4) Bottle storage: Put the prepared solution into a reagent bottle, cap the bottle stopper, and label it.

Discussion and exchange:

1. What is the role of the glass rod in this experiment?

Stir to speed up dissolution

2. In daily life, if you want to make substances dissolve in water faster, what are your best methods?

(1). Stirring

(2).Heating

(3).Change the state of matter from lump to powder

3. When a student used method 1 to prepare 35g of 16% seed selection solution, the actual solute mass fraction in the prepared solution was less than 16%. Could you please help this student analyze the possible reasons for this situation?

(Note: The student’s calculation is correct)

High School Entrance Examination Link

1. (2012 Luzhou, Sichuan) To prepare 100 g of sodium chloride solution with a mass fraction of 10%, the required instrument combination is ( )

① Pallet balance; ② Beaker; ③ Glass rod; ④ 100 mL measuring cylinder.

A． ①② B. ①②③

C. ①②③④ D. ①②④

2. (2010 Guangzhou, Guangdong) To prepare 2000 g of physiological saline (0.9% solute), the mass of NaCl needs to be weighed ( )

A． 9 g B. 18 g C. 90 g D． 180g

3. (2012 Foshan, Guangdong) In the experiment of preparing a sodium chloride solution with a certain solute mass fraction, the following experimental operations are not ().

Tip: When preparing a solution, the line of sight should be kept level with the lowest point of the concave liquid surface when reading the measuring cylinder. Answer: C

Summary and blackboard writing

1. Calculate. The mass of the solute and the volume of water are required.

2. Weigh. Weigh the required mass of solute using a pallet balance and measure the required volume of water using a graduated cylinder.

3. Dissolve. Pour the weighed amount of solute and water into the beaker and stir with a glass rod.

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"Configuration of Sodium Chloride Solution with Certain Solute Mass Fraction" Solution PPT Courseware 2:

"Preparation of Sodium Chloride Solution with Certain Solute Mass Fraction" Solution PPT Courseware 2 [Pre-class Test] 1. Mass fraction of solute =---------100% 2. When preparing 50g of 6% NaCl solution: (1) After calculation, weigh ____gNaCl on ____ and pour it into a dry and clean...

"Configuration of sodium chloride solution with a certain solute mass fraction" solution PPT courseware:

"Configuration of Sodium Chloride Solution with Certain Solute Mass Fraction" Solution PPT Courseware Knowledge Review: Solution is composed of solute and solvent. Mass of solution = Mass of solute + Mass of solvent = Volume of solution Density of solution Mass fraction of solute = Mass of solute/solution ..

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Update Time: 2024-06-30

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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