Question

Explain how 162g of NaOH dissolved in 150 mL water produce 50% NaOH solution and how does diluting it in 5.45 mL dilutes it to 0.1N. 14. Preparation of 50% NaOH Solution and of Standard Solutions 14.1 Dissolve 162 g of sodium hydroxide (NaOH) in 150 mL of carbon dioxide-free water. Cool the solution to 25°C and filter through a hardened filter paper or other suitable medium. Alternatively, commercial 50% NaOH solution may be used. 14.2 To prepare a 0.1 N solution, dilute 5.45 mL of the clear solution to 1 L with carbon dioxide-free water, mix well, and store in a tight polyolefin container. 15. Standardization 15.2 To standardize a 0.1 N solution, weigh accurately 0.95 ± 0.05 g of the dried KHC$_8$H$_4$O$_4$, and transfer to a 500-mL conical flask. Add 100 mL of carbon dioxide-free water, stir gently to dissolve the sample, add 3 drops of a 1.0% solution of phenolphthalein in alcohol, and titrate with NaOH solution to a color that matches that of an end point color standard.

          Explain how 162g of NaOH dissolved in 150 mL water produce 50% NaOH solution and how does diluting
it in 5.45 mL dilutes it to 0.1N.
14. Preparation of 50% NaOH Solution and of Standard
Solutions
14.1 Dissolve 162 g of sodium hydroxide (NaOH) in 150
mL of carbon dioxide-free water. Cool the solution to 25°C and
filter through a hardened filter paper or other suitable medium.
Alternatively, commercial 50% NaOH solution may be used.
14.2 To prepare a 0.1 N solution, dilute 5.45 mL of the clear
solution to 1 L with carbon dioxide-free water, mix well, and
store in a tight polyolefin container.
15. Standardization
15.2 To standardize a 0.1 N solution, weigh accurately 0.95
± 0.05 g of the dried KHC$_8$H$_4$O$_4$, and transfer to a 500-mL
conical flask. Add 100 mL of carbon dioxide-free water, stir
gently to dissolve the sample, add 3 drops of a 1.0% solution
of phenolphthalein in alcohol, and titrate with NaOH solution
to a color that matches that of an end point color standard.

Explain how 162g of NaOH dissolved in 150 mL water produce 50% NaOH solution and how does diluting
it in 5.45 mL dilutes it to 0.1N.
14. Preparation of 50% NaOH Solution and of Standard
Solutions
14.1 Dissolve 162 g of sodium hydroxide (NaOH) in 150
mL of carbon dioxide-free water. Cool the solution to 25°C and
filter through a hardened filter paper or other suitable medium.
Alternatively, commercial 50% NaOH solution may be used.
14.2 To prepare a 0.1 N solution, dilute 5.45 mL of the clear
solution to 1 L with carbon dioxide-free water, mix well, and
store in a tight polyolefin container.
15. Standardization
15.2 To standardize a 0.1 N solution, weigh accurately 0.95
± 0.05 g of the dried KHC8H4O4, and transfer to a 500-mL
conical flask. Add 100 mL of carbon dioxide-free water, stir
gently to dissolve the sample, add 3 drops of a 1.0% solution
of phenolphthalein in alcohol, and titrate with NaOH solution
to a color that matches that of an end point color standard.

Added by Amanda C.

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