2007-07-11 18:08:57 · 16 answers · asked by hanamay g 1 in Science & Mathematics ➔ Chemistry
Moles
Concentrations of Solutions.
The concentration of a solution is a measure of
the number of particles of the solute in the solvent.
A concentrated solution will have
a large number of particles of the solute in the solvent.
A dilute solution will have
a small number of particles of the solute in the solvent.
Concentrations can be expressed as mol dm-3 or grams per dm3.
The number of moles of solute in solution is given by the formula
moles = (C x V) ÷ 1000
where C = concentration in mol dm-3 (moles per dm3).
V = volume in cm3.
Example 1.
In a titration, 50 cm3 of 2 mol dm-3 sodium hydroxide
was exactly neutralised by 30 cm3 of hydrochloric acid.
What is the concentration of the hydrochloric acid?
Method.
1) Write the equation for the reaction.
sodium hydroxide + hydrochloric acid sodium chloride + water.
NaOH(aq) + HCl(aq) NaCl(aq) + H2O(l)
Use the big numbers to find the proportion of NaOH to HCl.
One mole of NaOH reacts with one mole of HCl.
2) Find how many moles of sodium hydroxide are present.
moles = (C x V) ÷ 1000.
The number of moles in 50 cm3 of 2 mol dm-3 sodium hydroxide
= (2 x 50) ÷ 1000
= 0·1 moles of sodium hydroxide.
3) From 1 and 2, 30 cm3 of hydrochloric acid
also contains 0·1 moles.
You can rearrange moles = (C x V) ÷ 1000 to give
C = (moles x 1000) ÷ V
C = (0·1 x 1000) ÷ 30
= 3·33.
The concentration of hydrochloric acid is 3·33 mol dm-3
2007-07-12 04:26:14 · answer #1 · answered by sylvie c 4 · 0⤊ 0⤋
NaOH + HCl = NaCl + H2O
This is the classic acid + alkali gives a salt + water.
In Words,
Sodium Hydroxide plus Hydrochloric Acid gives Sodium Chloride plus water.
2007-07-12 05:03:29 · answer #2 · answered by lenpol7 7 · 0⤊ 0⤋
Sodium Hydroxide is NaOH
Hydrochloric Acid is HCl
2007-07-14 12:03:03 · answer #3 · answered by Me 2 · 0⤊ 0⤋
NAOH is sodium hydroxide and HCL is hydrochloric acid
2007-07-11 18:40:13 · answer #4 · answered by Jem J 2 · 0⤊ 0⤋
did u meant sodium hydroxide+hydrochloric acid???
NaOH + HCl ---> NaCl + H20
2007-07-11 22:24:13 · answer #5 · answered by eyez reen 1 · 1⤊ 0⤋
Na+ + OH- + H+ +Cl- ---> H2O + Na+ +Cl- cancel out the sodium ions on the left and right then cancel out the cl- ion on the left and right leaving: H+ + OH- ---> H2O (net ionic equation)
2016-04-01 10:28:27 · answer #6 · answered by ? 4 · 0⤊ 0⤋
NaOH + HCL ----> NaCl + H2O
the ionic equation is H+ + OH- ----> H2O
2007-07-11 19:41:30 · answer #7 · answered by ♥JO the KrYpToN◄ 5 · 0⤊ 0⤋
NaOH+HCl------>NaCl+H2o (neutralization reaction its opposite is called hydrolysis reaction )
2007-07-11 18:18:14 · answer #8 · answered by Gohst 2 · 1⤊ 0⤋
NaOH+HCl---->NaCl+H2O
2007-07-11 18:14:22 · answer #9 · answered by shruti d 1 · 2⤊ 0⤋
NaOH+HCl ---> NaCl + H2O
2007-07-13 08:21:40 · answer #10 · answered by haile d 3 · 0⤊ 0⤋