HCl as a Primary Standard?

Question: Why is HCl not suitable as a primary standard?
Answer:  There are three main reasons why HCl is not suitable as a primary standard:

• HCl is not a solid at room temperature and pressure. 
• HCl cannot be obtained at a very high purity.
• HCl does not have a high molecular mass.

You can find out more about what makes, and does not make, a primary standard at:
http://www.ausetute.com.au/titrstand.html

Which Element has the Smallest Atomic Radius?

Question: Write the symbol for the element which has the smallest atomic radius Na, Si, Mg, P.

Answer: In general, atomic radius decreases going across a period of the Periodic Table.
Sodium (Na), magnesium (Mg), silicon (Si) and phosphorus (P) all belong to the third period.
In order of increasing atomic number they are: Na (Z=11), Mg (Z=12), Si (Z=14), P(Z=15)
Therefore, in order of decreasing atomic radius they are: Na > Mg > Si > P
So, phosphorus, symbol P, has the smallest atomic radius.

Read more about trends in atomic radius at AUS-e-TUTE: http://www.ausetute.com.au/trendar.html

Number of elements in period 2

Question: Give the number of elements in period 2 of the periodic table
Answer: 8

The rows going from left to right across the Periodic Table are called Periods.
The periods are numbered from 1 at the top to 7 on the bottom.
The first period contains only 2 elements: hydrogen and helium.
The second period contains 8 elements: lithium, beryllium, boron, carbon, nitrogen, oxygen,  fluorine and neon.

Find out more about how the periodic table is arranged at http://www.ausetute.com.au/pertable.html

Find more about the elements making up Period 2 at http://www.ausetute.com.au/trendpd2.html

I.C.E., R.I.C.E and Equilibrium

Need to calculate an equilibrium constant, but, you haven't been given all the equilibrium concentrations?
Then you need an I.C.E. Table (also known as a R.I.C.E. Table, an ICE chart, a RICE chart), and you can find out all about that at AUS-e-TUTE's new tutorial:
http://www.ausetute.com.au/ricetable.html

Now, if you are an AUS-e-TUTE Member, not only can go to the great member's only tutorial, but you can also:

• play the R.I.C.E. game
• answer the R.I.C.E. test questions and get immediate feedback
• do the R.I.C.E. exam
• make a R.I.C.E. worksheet (if you are a Teacher Member)
• do a R.I.C.E. quiz (if you a student with a Class or School Group)

And if you still haven't joined AUS-e-TUTE, you can sign up right here !

How many molecules are present?

Question: How many molecules are present in 4.21 mol of hydrogen gas?

Answer: 1 mole of anything contains 6.02 x 10²³ particles.
(Note that "mol" is the abbreviation for mole.)
So, 4.21 mol of hydrogen gas contains 4.21 x 6.02 x 10²³ = 2.53 x 10²⁴ molecules of hydrogen.

You can find a tutorial with worked examples at http://www.ausetute.com.au/namole.html

Which of the following is an acid-base indicator?

Question: Which of the following is an acid-base indicator?

1. hydrochloric acid 
2. sodium hydroxide 
3. water 
4. phenolphthalein

Answer: Phenolphthalein is an acid-base indicator

1. Hydrochloric acid is an acid
2. Sodium Hydroxide is a base
3. Water is neutral

What is the best indicator for titration?

Question: What is the best indicator for titration?
Answer: That all depends on what you are titrating!

If you doing an acid-base titration, then you will need to know the relative strengths of the acid and base you going to be using.
Once you have determined an approximate pH for the equivalence point of the neutralisation reaction, you use this as the pH of the endpoint of the titration in order to determine the best acid-base indicator to use.