Empirical Formula
What is the empirical formula for a compond that is 40% carbon, 6.7% hydrogen, and 53.3% oxygen?
CH2O
What is the pH of a solution with a H+ concentration of 1.0 x 10⁻³ M?
3
what is titration used for?
to determine the concentration of an unknown solution
What is an Arhenius acid?
A substance that ionizes to yield H+ in aqueous solutions.
A reaction where an acid and a base react in an aqueous solution to produce salt and water
How do you find the empirical formula from the percent of elements?
1. Convert the percentages to grams
2. convert grams to moles
3. divide by the smallest number of moles
4. round to thhe whole number.
How do you calculate the pOH of somethign if you know the pH?
pOH = 14 - pH
what is the equivalence point in a titration?
the point where the number ogf moles of H+ equals the number of moles of OH-
What is a BRonsted-Lowry base?
A substance that receives an H+ ion from another substance.
What are the products of a neutralization reaction between NaOH and HCl?
NaCl and H₂O
Whats the empirical formula for a compound that contains 85.7% carbon and 14.3% hydrogen
CH2
What's the pH of water (H2O)?
7
what is the concentration of the unknown solution if 25 cm³ of an unknown solution reacts with 20 cm³ of 0.5 M solution
0.4 M
What is a conjugate acid?
A compound that is formed when an acide gives an H+ to a base
What is the net ionic equation for the reaction of HCl and NaOH?
H+ + OH+ → H2O
What is the empirical formula of a substance that has 2.3 grams of sodium, 1.3 grams of sulfur, and 2.4 grams of oxygen.
Na2SO3
what is the pH of a solution with a pOH of 4?
10
what is an indicatorused for in titrations?
it is used ti show the color change at the end of the titration
find the pH and pOH of a 0.025 NaOH solution?
pH = 12.4
pOH = 1.6
How do you find the unknown concentration in a titration?
Unknown concentration = Known concentration * (Volume of known / Volume of unknown)
What is the difference between molecular formula and empirical formula?
The molecular formula is the number of atoms of each element in a molecule but te empirical formula is the simplifid ratio of the elements in the compound.
calculte the pOH of a solution with OH concentration of 2.5 x 10-3 M
2.6
what is the concentration of the sulfuric acid if 40 cm³ of sulfuric acid neutralizes 20 cm³ of 0.5 M sodium hydroxide
0.25 M
What's the pH of a 2.00 M solution of HNO2, given that the Ka for nitrous acid is 4.5 x 10-4. You need a RICE table.
Calculate the concentration of sulfuric acid that is needed to neutralize 20.0 mL of sulfuric acid if there is 40.0 mL of 0.2 M NaOH
0.1 M