October 23, 2019

To convert grams to moles and vice versa, we must always use Molar Mass.

Molar Mass can be calculated using the Periodic Table.

To calculate the molar mass, we multiply each atom in the molecule by its atomic mass found in the Periodic Table and multiply by the number of atoms.

For example, to calculate the molar mass of CO2

C= 1*12.011 = 12.011

O= 2*15.999 = 31.998

12.011 + 31.998 = 44.009 g/mol

To convert grams to moles, we...

October 21, 2019

Lactic acid has one acidic hydrogen. A 0.1 M solution of lactic acid has a pH of 2.44. Calculate Ka for lactic acid? When we do acid/base questions, we always need to ask ourselves 2 questions.

Question1 Do we have an acid or a base?

In this case the question itself, told us that we are dealing with an acid.

Question 2 Is this a weak or a strong acid?

Strong acids are: HCl - hydrochloric acid HNO3 - nitric acid H2SO4 - sulf...

October 16, 2019

Will precipitation occur when the following solutions are mixed? If so, write a balanced chemical equation for the reaction.

(a) Na2CO3 and AgNO3, (b) NaNO3 and NiSO4, (c) FeSO4 and Pb(NO3) 2

In order for precipitation occur, we must first write out the products of each reaction. These are double replacement reactions, where we can use the following formula: AB+CD --> AD + CB to predict the products. We also need to remem...

September 30, 2019

A sample of the male sex hormone testosterone,C19H28O2, contains 3.88 * 10^21 hydrogen atoms.

(a) How many atoms of carbon does it contain?

(b) How many molecules of testosterone does it contain?

(c) How many moles of testosterone does it contain?

(d) What is the mass of this sample in grams?


To find atoms of carbon, we take the number of hydrogen atoms and multiply the number by 19/28 (ratio of carbon to hydrogen...

September 25, 2019

How To Name Acids 

An acid is a substance that releases H+ ions (hydrogen ions) when it is dissolved in water.

Acids can be divided into 2 categories: binary acids and oxyacids.

Binary Acid - consists of H + nonmetal

Examples of binary acids are HCl, H2S, HBr

Naming a binary acid - HYDRO _____ IC ACID

HCl - hydrochloric acid

H2S - hydrosulfuric acid

Oxoacid - consists of H + Polyatomic ion containing O

Examples of oxoacids are H...

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