A suitable indicator for the titration of the weak acid CH
3
COOH(aq) and the strong base NaOH(aq) would be either
thymol blue
(pH range 8.0 – 9.6) or phenolphthalein
Which indicator is suitable for the titration of HCl and NaOH and why?
For a weak acid vs strong alkali titration,
phenolphthalein
is the most suitable indicator. This is so because the last drop of added alkali brings the pH of the solution in the range in which phenolphthalein shows sharp colour change.
Which indicator is used for titration of NaOH and HCl?
In the acid-base titration involving strong base and weak acid,
methyl red
can be used as an indicator.
Which indicator is used for the titration of HCl?
Theory. Hydrochloric acid solution may be titrated against sodium carbonate solution using
methyl orange indicator
. When weak base is titrated with a strong acid solution is slightly acidic at end point.
What indicator will be used in the HCl and NaOH titration experiment provided in the lab manual?
The titrant is a standard solution of sodium hydroxide. The indicator is
phenolphtalein
, and it is added to the acid, or in this case, the analyte. This is because it is colorless in an acid, but pink in basic solutions. What is the primary standard used in this experiment?
What happens when you add HCl to NaOH?
For example, if you mix hydrochloric acid (HCl) with sodium hydroxide (NaOH), the products formed are
water (H20) and sodium chloride(NaCl)
, which is well-known as table salt.
Which indicator is best for titration?
The
indicator phenolphthalein
, whose range spans from pH 8 to 10, therefore makes a good choice for this type of titration. If you don’t know the pH change around the equivalence point of your titration, consult a general chemistry textbook.
Why is HCl used in titration?
As it is added, the
HCl is slowly reacted away
. The point at which exactly enough titrant (NaOH) has been added to react with all of the analyte (HCl) is called the equivalence point. Up to the equivalence point, the solution will be acidic because excess HCl remains in the flask.
What is the balanced equation of HCl and NaOH?
Let’s see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is:
NaOH + HCl → H
2
O and NaCl
.
Why is used Na2CO3 with HCl in this titration?
Purpose of Titration
You can use the technique of titration to determine the concentration of a sodium carbonate solution using a solution with a known concentration of hydrochloric acid, or vice versa.
HCl gradually reduces the alkalinity of the solution until the pH is 7
.
Is used for standardization of HCl in neutralization titration?
Titration is one type of analytical procedure often used in standardization. In a titration, an exact volume of one substance is reacted with a known amount of another substance. … In the second procedure the
standardized NaOH
will be used to determine the molarity of a hydrochloric solution (HCl).
What is Colour of acid in phenolphthalein indicator?
| Indicator Acidic Alkaline | Methyl orange Red Yellow | Phenolphthalein Colourless Pink |
|---|
What is the aim of titration experiment?
The purpose of the titration is
the detection of the equivalence point, the point at which chemically equivalent amounts of the reactants have been mixed
. The amount of reactants that have been mixed at the equivalence point depends on the stoichiometry of the reaction.
How do you standardize HCl with NaOH?
To standardize NaOH, start by
pipetting 10.0 ml of 0.1
N hydrochloric acid (HC1) into a flask. Add approximately 50 ml of water (remember, not tap water) and three drops of methyl red indicator. Fill a 25 ml buret with the 0.1 N sodium hydroxide solution and record the initial volume.
What is the purpose of an indicator in a titration?
The common application of indicators is
the detection of end points of titrations
. The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values.
