4.4 Solution Concentration and Solution StoichiometryIf you want to learn more check out What is the definition of timed drew?
Solution - homogeneous mixture → looks the same, can’t tell by looking at it that it’s a solution
Solvent - what does the dissolving → moreWe also discuss several other topics like What is the first American Avant-Garde group?
Solute - what is dissolved → less
Aqueous solution → solution with water
**TIP** “solvent” has more letters than “solute”, so there is always more of the solventDon't forget about the age old question of What are the benefits of working in a highly competitive rapidly changing retail environment?
Example: What is the molarity of a solution containing 25 grams of NaCL in 2.75 liters of water?If you want to learn more check out michael lynch uga
Given: 25 g NaCL find: molarity of the solution
2.75 L waterWe also discuss several other topics like What are the factors of fashion as a form of communication?
Use molarity formula
Step 1:Convert grams to molesIf you want to learn more check out How is force related to acceleration?
x= 0.428 mol NaCL
Step 2:Plug valves into formula and solve
M = 0.156 mol / L
Example: How many liters of 0.125 M NaCL solution contain 0.255 mol NaOH?
0.1256 M NaOH Find: volume (L) of solution
0.255 mol NaOH
This is what we have
M = this is what we are looking for
Step 1:Plug in values
0.125 M NaOH =
Step 2:Solve for the unknown
Volume (L) =
Volume = 1.8 L of solution
Always write and carry through the units and the type of chemical you are using in calculations. This will prevent simple mistakes and provide a quick way to check your work. If your units don’t match, you did something wrong!
M1V1 = M2V2
M1 = molarity of initial solution M2 = molarity of final solution
V1 = volume of initial solution V2 = volume of final solution
This formula is used for more than dilutions, it is also used for acid - base titrations - Memorize this formula!
Volume does not have to be in liters as long as the units match!
Example: What volume of water is needed to dilute 200 mL of 5 M HCL to 0.1 M HCL?
Given: 200 mL HCL (initial) find: V2
5 M HCL (initial)
0.1 M HCL (final)
Step 1: Plug in knowns to the M1V1 = M2V2 formula
(5 M HCL)(200 mL HCL) = (0.1 M HCL)(V2)
Step 2: Solve for the unknown
V2 = 10,000 mL → or 10 L
Example: What volume, in mL, of a 0.15 M HNO3 solution will react completely with 3.75 mL of 0.108 M Na2CO3 solution according to the following balanced chemical equation
Na2CO3(aq) + 2HNO3(aq) → 2NaNO3(aq) + CO2(aq) + H2O(e)
0.15 M HNO3 find: volume of HNO3
3.75 mL Na2CO3
0.108 M Na2CO3
Step 1: Find the number of moles of Na2CO3 using molarity equation