Write the equilibrium expression showing the dissociation of Ca(OH)2 in water. (Omit states-of-matter from your answer. )

Chemistry

1 answer:

Monica [59]3 years ago

7 0

Answer:

Ca(OH)2 --> Ca2+ + 2OH-

Explanation:

Calcium hydroxide is sparingly soluble in water. It dissociates to give the following:

The net ionic equation :

Ca(OH)2 + H2O --> Ca2+ + 2OH- + H2O

Since, H2O doesn't affect the overall reaction, therefore;

Ca(OH)2 --> Ca2+ + 2OH

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How many grams of mercury are needed to react completely with 157g of sulfur to form hgs?

Salsk061 [2.6K]

To solve this we need to balance the equations first.
So Hg + S --> HgS is balanced
One mole of Hg requires one mole of S to form one mole of HgS.
Number of moles of Sulphur = mass/ molar mass = 157/32 = 4.906
So 4.90 moles of S reacts with 4.90 moles of Hg.
Hence there are 4.90 moles of 4.90 of Hg.
Mass = number of moles * molar mass of Hg
Mass = 4.906 * 200.59 = 982.891g

8 0

3 years ago

Read 2 more answers

A 40.2 g sample of a metal heated to 99.3Â°C is placed into a calorimeter containing 120 g of water at 21.8Â°C. The final temper

aliina [53]

Answer:

B) Iron (c=0.45 J/g°C)

Explanation:

Given that:-

Heat gain by water = Heat lost by metal

Thus,

$m_{water}\times C_{water}\times (T_f-T_i)=-m_{metal}\times C_{metal}\times (T_f-T_i)$