A beaker contains a solution of calcium hydroxide (Ca(OH)2) in water. A student places a straw in the beaker and then breathes into the solution through the straw. As the student breathes into the solution, a white precipitate forms. What is the most likely composition of the precipitate? H2O CaCO3 CH3OH


Answer 1

The most likely composition of the precipitate is CaCo3

What's known as the answer?

A homogenous combination of two or greater materials in relative amounts that can be varied continuously up to what is referred to as the limit of solubility. The term solution is commonly applied to the liquid country of matter, but solutions of gases and solids are feasible.

What's the answer to calcium hydroxide and water referred?

Limewater is the commonplace call for a saturated aqueous answer of calcium hydroxide. Calcium hydroxide, Ca(OH)2, is moderately soluble at room temperature in water (1.5 g/L at 25 °C).

What's a solution of calcium hydroxide and water?

Calcium hydroxide, additionally known as slaked lime, Ca(OH)2, is obtained by the movement of water on calcium oxide. when combined with water, a small proportion of it dissolves, forming an answer known as limewater, the relaxation final as a suspension referred to as milk of lime.

When Ca OH 2 is dissolved in water what are the goods?

A saturated solution of Ca(OH)2 can be prepared with the aid of the response of calcium metal with water. Calcium is oxidized through water, yielding calcium hydroxide and hydrogen fuel.

Learn more about the solution here:


Answer 2

CaCo3 was the correct answer.

Related Questions


Why is O2 necessary for rusting?


O2 isn't necessary for rusting, but some source of oxygen is required. Rust is just another name for iron oxide, and without oxygen there can't be oxide.  

Hope this helps,


= Oxygen

Rusting, is a common name for a process which is scientifically know as oxidising. In this process, materials get oxidised, which as its name suggest, is an interaction between the material and oxygen.

So yes, there must be oxygen in the process. If there wasn't a source of oxygen, oxides (compound with oxygen in it) wouldn't be formed.

Hope it helped,



If you bang on a large metal gong with a stick, producing a loud sound that can be heard by your friend down the street, how does this sound travel to your friend’s ear? Banging the gong sets the metal particles in motion, these particles move through the air to your friend’s ear.

Banging the gong releases sound particles that travel as vibrations through the air to your friend’s ear.

Banging the gong vibrates the metal, which passes its energy to the air, sending a sound wave through the air to your friend’s ear.

Banging the gong creates air particles; these particles vibrate. Their energy travels through the air to your friend’s ear, but the air particles themselves do not move.






The total volume of hydrogen gas needed to fill the hindenburg was 2.00 × 108 l at 1.00 atm and 25.° c. How much energy was evolved when it burned?


The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.

The correct answer to the question is .

What is ideal gas law?
  • The ideal gas law, also called the general gas equation, is the equation of the state of a hypothetical ideal gas.
  • It is a good approximation of the behavior of many gases under many conditions, although it has several limitations.

According to the question, the ideal gas law will be:-


  • P = pressure of gas = 1 atm
  • V = volume of gas =
  • T = temperature of gas =
  • R = gas constant = 0.0821 Latm/mole
  • n = number of moles of gas

Placed all the values to the question.

The enthalpy of combustion of hydrogen is -286 KJ/mole. (standard value) As 1 mole of hydrogen gas burned it evolved energy = -286 KJ

Hence, is the answer

For more information about the ideal gas law, refer to the link:-

Answer : The energy evolved when it burned was,

Solution :

First we have to calculate the moles of hydrogen gas by using ideal gas equation.


P = pressure of gas = 1 atm

V = volume of gas =

T = temperature of gas =

R = gas constant = 0.0821 Latm/moleK

n = number of moles of gas

Now put all the given values in the above formula, we get the moles of hydrogen gas.

Now we have to calculate the amount of energy evolved.

The combustion reaction of hydrogen will be,

The enthalpy of combustion of hydrogen is -286 KJ/mole. (standard value)

As 1 mole of hydrogen gas burned it evolved energy = -286 KJ

So, of hydrogen gas burned it evolved energy =

Therefore, the energy evolved when it burned was,


How many atoms are in 3NaOH


There are 3 Na, 3 O, and 3 H since you distribute the coefficient 3 to all atoms. So, if you add them up, there are 9 atoms in that compound. Hope that helps!

A Student Formulated A Hypothesis That Cotton Will Grow Larger Bolls ( Pods ) If Magnesium Is Added To The Soil. The Student Has Two Experimental Fields Of Cotton, One With Magnesium And One Without. Which Data Should Be Collected To Support This Hypothesis? (a) Height Of The Cotton Plants In Both Fields

(b) Diameter of the cotton bolls in both fields

(c) Length of the growing season in both fields

(d) Color of the cotton bolls in both fields


Hypothesis is a smart guess that you make on the result of your experiment. You make this even before doing the experiment through inferential analysis. If the hypothesis you made was that, cotton will grow larger balls, then in the experiment, you should measure the cotton boll's size. The size should be in terms of diameter. So, the answer is b.

Ti-84 plus why is my solver function only showing one solution?


Not all functions have more than one solution, this function could have a limit, or might not be able to equal negative numbers for example.

What are some physical and chemical properties


Physical properties are things like what temperature  does it boil at, what temperature does it melt at, does it freeze at, what color is it, etc.

Chemical properties are things like does it react with other chemicals, is it poisonous, is it flammable, oxidation states, what happens when you put it in water, etc.
Physical Riping paper During wood Almost anything that you can do to an object, but it stays the same thing. Chemical Burning wood Nice smelling shoes to nasty shoes Anything that changes substance

Explain how ideas about the atom have changed over time.



John Dalton was the first to record his ideas about the atom; he thought that matter was made up of these tiny particles called atoms which he thought of as tiny spheres that couldn’t be divided.
Then J J Thompson carried out experiments that led him to discover the electron. Putting his discoveries together he settles on the now famous ‘plum pudding model’ that describes the atom as a ball of positive charge with negative electrons embedded throughout - much like that of currants in a Christmas pudding.
Ernest Rutherford then put together an experiment to test the ideas of the plum pudding model. He fired positively charged alpha particles at thin gold foil; most alpha particles went straight through however some were scattered in differing directions. From this he realised that the mass of the atom is concentrated in the centre (now know as the nucleus) and that the nucleus is positive.
The most up to date model as we know it is the idea of the positive nucleus containing protons and neutrons with orbitals containing negative electrons surrounding the nucleus in shells.
At first we thought atoms were just electrons and were negatively charged, but now we’ve learned that is can create different and many more substances.

Given the density of Au is 19.3 g/cm3. Determine the mass of gold in an ingot with the dimension of 10.0 cm x 4.00cm x 3.00cm.


Answer: The mass of gold is 2316 grams.


To calculate the volume of cuboid, we use the equation:


V = volume of cuboid

l = length of cuboid = 10 cm

b = breadth of cuboid = 4 cm

h = height of cuboid = 3 cm

Putting values in above equation, we get:

To calculate mass of a substance, we use the equation:

Putting values in above equation, we get:

Hence, the mass of gold is 2316 grams.


2.317 kg


Density = mass / vol

Vol = 10 x4 x 3 =120

Density=19.3 gm/cm3

Mass= density x vol =2316 gm or 2.317 kg

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