3 years ago

Numbers 15-21 HELP PLEASE!!

Chemistry

2 answers:

Bas_tet [7]3 years ago

5 0

Re upload the pic I can’t see it ://

bagirrra123 [75]3 years ago

4 0

I wish I could help you, but I cannot see your paper. Please re-upload so I can help you : )

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A NaOH solution is standardized using the monoprotic primary standard potassium hydrogen phthalate, KHP (204.22 g/mol.) If 0.698

kakasveta [241]

Answer:

0.07789 M is the sodium hydroxide concentration.

Explanation:

Mass of potassium hydrogen phthalate = 0.6986 g

Molar mass of potassium hydrogen phthalate = 204.22 g/mol

Moles of potassium hydrogen phthalate = $\frac{0.6986 g}{204.22 g/mol}=0.003421 mol$

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According to reaction , 1 mole og KHp reactswith 1 mole of NaOH , then 0.003421 moles of KHp will react with :

$\frac{1}{1}\times 0.003421 mol=0.003421 mol$

Moles of NaOH = 0.003421 mole

Volume of NaOH solution = 43.92 ml = 0.04392 L ( 1 mL = 0.001L)

$Concentration=\frac{Moles}{Volume(L)}$

Concentration of NaOH :

$\frac{0.003421 mol}{0.04392 L}=0.07789 M$

0.07789 M is the sodium hydroxide concentration.

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3 years ago

A natural resource that is replaceable through a cycle in nature or sustainable practice is called a ______________.

allochka39001 [22]

Answer:

renewable recource.

Explanation:

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