Molarity
#1
What is the formula to calculate molarity?
M (molarity) = moles / Liters
#2
Convert 750 mL to L
750 / 1000 = 0.750 L
mL / 1000 = L
#7)
At what temperature is the solubility of NaNO3 equal to the solubility of KNO3
Look for where the lines cross!
Around 73 degrees C
#14 - Which is slightly basic?
Battery acid, Egg yolk, Baking soda, Lye
Slightly basic = pH slightly over 7
C) Baking Soda (pH = 9)
#11
At what temperature would 70 g of NH4Cl create a saturated solution?
Saturated = on the line
Find where 70 g crosses NH4Cl and look down to 90 C
#1
What is the formula for dilutions?
M1 x V1 = M2 x V2
or
___ of (x) ____ / what's left
#5
What is the final volume of a solution if 1.75 L is diluted from 6.00 M to 2.50 M?
(1.75 L x 6.00 M) / 2.50 M = 4.2 L
#8
At 50 C and 100 g of KNO3 is the solution saturated, unsaturated, or supersaturated?
supersaturated
the point is above the line for KNO3
#15
What is the name for H3P - it has a special name!!
Phosphine
Bonus Question - Solubility
How much NH3 would dissolve in 200 g of water at 0 C?
Read carefully! If you have 200 g you need to double your answer because the chart is per 100 g water.
90 x 2 = 180
#3
What is the molarity of 750 mL of solution containing 9.00 moles of NaCl
first 750 / 1000 = 0.750 L
then 9.00 mol / 0.750 L = 12 M
#13 Identify the solute and solvent for each:
Kool-aid in water
Chocolate syrup in milk
#9
what mass of NH4Cl is needed to create a saturated solution at 70 C?
60 grams!
Find where 70 C crosses the NH4Cl line and look to the side to find grams
#16
What is the correct name for H2SO4?
Sulfuric acid
#17
What is the correct name for NaOH
Sodium Hydroxide
#4
How many moles of CaBr2 are needed to make 0.750 L of 2.75 M solution
M = moles/L --> M x L = moles
0.750 x 2.75 = 2.06 moles
#19
If the pH is 3.5, what is the pOH?
pH + pOH = 14 --> 14 - pH = pOH
14 - 3.5 = 10.5 for the pOH
#10
What mass of NaNO3 could dissolve in 100 g of water at 10 C?
80 grams
Find where NaNO3 crosses 10 C and look across
#18
Which substance has the highest pH?
H2SO4, H2O, MgCl2, NaOH
Highest pH = base
NaOH is the only base listed!
#22 Which is most concentrated?
2.5 mol in 1 L, 2.0 mol in 0.5 L, 4.0 mol in 2.5 L, or 6.0 mol in 1.8 L
Calculate mol/L for each
C) 2.0 mol in 0.5 L is highest molarity (M = 4)
#6
What is the molarity of a solution with 50.0 g of NaCl in 1.5 L of water?
First g / molar mass = moles. Then mol/L = M
50.0 g / 58.44 g/mol = 0.855 mol
0.855 mol / 1.5 L = 0.57 M
#20
[H+] - 1 x 10-5. What's the pH?
Use exponent from [H+] for pH
so our pH is 5
#12
which substance has the largest increase in solubility from 30 to 70 C?
KNO3
It has the line with the steepest slope
#21
If the methyl orange test turned yellow and Litmus stayed red what is the pH? 4.0, 2.9, 4.4, or 4.6
Needs to be between 3.1 and 4.4, but under 4.5
Could be A) 4.0 or C) 4.4, but A is the better choice
#23
Balance and label the reaction with the acid, base, and salt
1 H3P (acid) + 3 NaOH (base) --> 1 Na3P (salt) + 3 HOH (water)