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3 years ago

What happens when plaster of Paris is treated with co2

1 answer:

5 0

) adding phosphoric acid, said phosphoric acid reacting with said calcium carbonate to release gaseous carbon dioxide bubbles, and said water providing water of hydration to said plaster of Paris to form gypsum that sets around said carbon dioxide bubbles thereby forming said foamed plaster.

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NaOH was titrated to the phenolphthalein endpoint with a known concentration of HCl. The student conducting the experiment place

GarryVolchara [31]

Answer:

The concentration of NaOH solution is 3,65M

Explanation:

The neutralization of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

You are titrating 12,67 mL HCl 2,74M with your NaOH solution, the moles of HCl in the beaker are:

12,67 mL ≡ 0,01267L× $\frac{2,74 moles}{1L}$ = 0,0347 moles HCl ≡ 0,0347 moles NaOH

The volume that you require for total neutralization of 12,67 mL HCl 2,74M is:

13,65 mL - 4,50 mL = 9,50 mL ≡ 0,0095L

Thus, the concentration of NaOH solution is:

$\frac{0,0347 moles}{0,0095L}$ = 3,65M

I hope it helps!

8 0

4 years ago

How many joules of heat are lost when 150.0 g of steam are cooled from 124. C to 86 C?

Alinara [238K]

The amount of joules of heat that are lost when 150.0 g of steam are cooled from 124 °c to 86 °c is = -11343 joules

calculation

heat(Q) = mass(m) x specific heat capacity(C) x change in temperature (ΔT)

where,

Q=? joules

M=150.0 g

C for steam = 1.99 j/g/°c

ΔT= 86°c-124°c = -38°c

Q is therefore = 150.0 g x 1.99 j/g/°c x -38°c =-11343 joules

6 0

4 years ago

How many molecules of ammonia, NH3, are in 3 moles of NH3?

alexandr1967 [171]

The number of molecules in one mole of any substance is equal to Avagadro's number

Avagadro's number is 6.023 X 10²³

Thus

1 mole = 6.023 X 10²³ molecules

for ammonia we are provided with three moles

so to obtain the total number of molecules of ammonia in three moles we will multiply the Avagadro's number with three

total molecules = 3 X 6.023 X 10²³

Total molecules of ammonia = 18.069 X 10²³

In scientific notation

Total molecules of ammonia = 1.8069 X 10²⁴ = 1.81 X 10²⁴

8 0

3 years ago

Separation of mixture by gravity of sodium carbonat into calcium chloride

Natali5045456 [20]

By combining aqueous solutions of calcium chloride and sodium carbonate, a solid calcium carbonate is produced. The CaCO 3 is trapped by the paper which forms as a precipitate, but the NaCl passes through the filter paper with the water.

Explanation:

In gravity separation, a combination of two incompatible liquids can be separated by using a separating funnel. The operation is based on the variation within the density of the liquids. The heavier liquid that settles down is drained out first from the funnel into the beaker, and then the lighter liquid is drained out into another beaker.

Filtration is used to separate a substance from a mixture because one is insoluble and the other is soluble. By combining aqueous solutions of calcium chloride and sodium carbonate, solid calcium carbonate is produced.

CaCl 2 (aq) + Na 2 CO 3 (aq) → CaCO 3 (s) + 2NaCl(aq)

A filter paper is inserted in a funnel and the mixture may be poured through a funnel. The NaCl is passed through the filter paper with the water but CaCO3 is trapped by the paper which forms the precipitate.

8 0

4 years ago

Increasing the temperature gives particles more

vagabundo [1.1K]

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly

7 0

3 years ago

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