"Representation of Solution Concentration" Solution PPT Courseware 6

Description

"Representation of Solution Concentration" Solution PPT Courseware 6

knowledge network

Prepare a solution with a certain mass fraction

Simple calculation of solute mass fraction

Calculation of solute mass fraction

Calculation of solution dilution problems

Prepare a solution with a certain mass fraction

Solute mass fraction and chemical equation

combined calculations

Knowledge review

Knowledge point 1: Calculation of solute mass fraction

The solute mass fraction is the ratio of ________ mass to ___________ mass.

Related formulas:

①Solute mass fraction = solute mass solution mass × 100%

(Applicable to both the calculation of saturated solutions and the calculation of unsaturated solutions)

②Solution mass = __________ mass + ________ mass

③Solute mass = ________ mass × mass fraction of solute; solution mass = volume of solution × density of solution

Knowledge point 2: Calculation of solution dilution problems

Calculation principle:

During the process of diluting a solution, the mass of _______ does not change.

Calculation formula:

Mass of concentrated solution × mass fraction of solute in concentrated solution =

Mass of dilute solution × mass fraction of solute in dilute solution.

[Note] ①When two solutions are mixed, the masses can be added or subtracted, but the volumes cannot be added or subtracted.

②The dilution method can be diluting with water or diluting a concentrated solution with a dilute solution. The following equality relationships exist before and after mixing:

Mass of concentrated solution × mass fraction of solute in concentrated solution + mass of dilute solution × mass fraction of solute in dilute solution = mass of mixed solution × mass fraction of solute in mixed solution.

③Keep the units consistent when calculating.

Knowledge point 3: Prepare a solution with a certain mass fraction

Preparing a solution with a certain mass fraction involves four steps:

① Calculate; ② Weigh; ③ Dissolve; ④ Bottle and store.

The first step involves calculation of the mass of the solute,

Mass of solute = ________ mass × mass fraction of solute,

Mass of solvent = ________ mass - ________ mass,

In experiments, it is often necessary to convert the mass of the solvent into volume measurement.

[ Tips

The reason why the solute mass fraction of the prepared solution is smaller than the actual value may be:

①Look up at the reading when measuring liquid;

②The weights and medicines are placed upside down;

③The beaker used to prepare the solution is not dry, etc.

Example analysis

►Type 1: Simple calculation of solute mass fraction

Proposition perspective: Test students’ mastery of simple calculations of solute mass fractions.

Example 1: In agriculture, a sodium chloride solution with a mass fraction of 16% is often used for seed selection. Now we need to prepare 200 kg of this solution. The mass of sodium chloride is ____kg and the mass of water is _____kg.

[Method Instructions] When doing this type of question, you should pay attention to the calculation formula of solute mass fraction and the application of its deformations, and at the same time, you should clearly distinguish the difference between solvent quality and solution quality.

[Analysis] The mass of NaCl needs to be weighed 200 kg×16%=32 kg,

The required mass of water is 200 kg-32 kg=168 kg.

►Type 2: Calculation of dilution issues

Proposition perspective: Test students’ ability to calculate the mass fraction of solutes in the dilution process.

Example 2 Figure 9-1 is part of the label on a certain reagent bottle.

To dilute the concentrated sulfuric acid into 100g of 19.6% dilute sulfuric acid, the mass of this concentrated sulfuric acid is required to be ______g.

[ Method Tips , everyone should pay attention to find out the actual mass of the solution before and after dilution and the corresponding solute mass fraction.

Keywords: solution teaching courseware, solution teaching courseware showing the concentration of a solution, Guangdong Education Edition ninth-grade chemistry PPT courseware download, second volume, ninth-grade chemistry slide courseware download, solution PPT courseware download, solution concentration PPT courseware download,. PPT format;

For more information about the PPT courseware "Representation of Solution Concentration and Dilution", please click the Solution ppt Representation of Solution Concentration ppt tag.

"Representation of Solution Concentration" Solution PPT Courseware 5:

"Representation of Solution Concentration" Solution PPT Courseware 5 New Knowledge Preview 1. Preparing a solution with a certain solute mass fraction 1. Experimental steps: (1)________; (2) weigh (measure); (3) dissolve; (4)__________. 2. Instruments required for the experiment: (1) If the solute is...

"Representation of Solution Concentration" Solution PPT Courseware 4:

"Representation of Solution Concentration" Solution PPT Courseware 4 New Knowledge Preview 1. Concentration of Solution 1. The concentration of a colored solution can be roughly expressed by the solution ____________, but it cannot be expressed for a colorless solution. 2. To quantitatively express the concentration of a solution, often...

"Representation of Solution Concentration" Solution PPT Courseware 3:

"Representation of Solution Concentration" Solution PPT Courseware 3 Review Solid Solubility and Its Influencing Factors At a certain temperature, the mass of a solid substance dissolved when it reaches saturation in 100g of solvent is called the solubility of this substance in this solvent . Gas solubility and...

File Info

Update Time: 2024-10-03

This template belongs to Chemistry courseware Cantonese Education Edition Ninth Grade Chemistry Volume 2 industry PPT template

Preview