Acid-Bases Titration 1

___ is a Brønsted base that is used as a primary standard for the standardization of strong acids

• Sodium Carbonate

• Calcium carbonate

• Sodium Bicarbonate

• Sodium Chloride

Answer explanation

Sodium carbonate is a Brønsted base that is used as a primary standard for the standardization of strong acids

___ is used to detect the ___ end point,

• Methyl Orange, First

• Methyl Orange, Second

• Phenolphthalein, First

• Phenolphthalein, Second

Answer explanation

Phenolphthalein is used to detect the first end point,

Phenolphthalein is uses to detect the first end point and

____ is used to detect the ___ end point

• Phenolphthalein, First

• Phenolphthalein, Second

• Methyl Orange, First

• Methyl Orange, Second

Answer explanation

And Methyl orange is used to detect the second end point

The methyl orange end point can be used (without boiling) by adding a blue dye, xylene cyanole FF, to the indicator. This mixture is called ______.

• Identified methyl orange

• Mix Methyl orange

• Modified methyl orange

• Modified methyl red orange

Answer explanation

The methyl orange end point can be used (without boiling) by adding a blue dye, xylene cyanole FF, to the indicator. This mixture is called modified methyl orange.

____ is a salt of carbonic acid

• Sodium carbonate

• Calcium carbonate

• Sodium Bicarbonate

• Sodium Chloride

Answer explanation

Sodium carbonate is a salt of carbonic acid.

Initial concentration of all carbonate species (this includes H2CO3, HCO3−,

and CO32− and is typically denoted by CT ) is ___.

• 0.001M

• 0.01M

• 0.1 M

• 0.2M

Answer explanation

Initial concentration of all carbonate species (this includes H2CO3, HCO3−,

and CO32− and is typically denoted by CT ) is 0.1 M

One acid should be at least ___ times weaker than the other to titrate separately.

• 10⁴

• 10⁵

• 10⁶

• 10⁷

Answer explanation

One acid should be at least 10⁴ times weaker than the other to titrate separately.

In general, one Ka value must be at least 10⁴ times greater than the other to clearly see the individual end points separately

Bonus:

How will you relate acid-base in your lovelife?

Also, if one of them is a strong base, the weak base must have a Kb no greater than about ___ to obtain separate end points.

• 10⁻⁵

• 10⁻⁶

• 10⁻⁷

• 10⁻8

Answer explanation

Also, if one of them is a strong base, the weak base must have a Kb no greater than about 10⁻⁵ to obtain separate end points.

In your own terms, what is Analytical Chemistry?