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3 years ago

How can you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?

Chemistry

1 answer:

ruslelena [56]3 years ago

8 0

Explanation:

1) $Ca(NO_3)_2$ solution

$Ca(NO_3)_2(aq)\rightarrow Ca^{2+}(aq}+NO_3^{1-}{aq}$

To the solution of calcium nitrate add few drops of sodium hydroxide. Formation of white solid calcium hydroxide will be observed.

$Ca(NO_3)_2(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+ Ca(OH)_2(aq)(white)$

2) $Zn(NO_3)_2$ solution

$Zn(NO_3)_2(aq)\rightarrow Zn^{2+}(aq}+NO_3^{1-}{aq}$

To the solution of $Zn(NO_3)_2$ add few drops of liquid ammonia which will precipitate out white gelatinous zinc hydroxide from the solution. And this zinc hydroxide gets dissolves when excess of liquid ammonia is added to the solution.

${Zn^{2+}(aq)+2NH_3(aq)+2H_2O(l)\righarrow Zn(OH)_2(s)(\text{white precipitate})+2NH_4^{+}(aq)}$

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Rocks are solids composed of one or more minerals true or false

Yuki888 [10]

The answer is true
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3 years ago

iron will react with oxygen to produce Fe2O3. how many grams of Fe2O3 will he produced if 0.18 mil of Fe reacts?

nasty-shy [4]

Answer:

14.4g

Explanation:

First, we need to write a balanced equation for the reaction between Fe and O2 to produce Fe2O3. This is illustrated below:

4Fe + 3O2 —> 2Fe2O3

From the balanced equation,

4moles of Fe produced 2moles of Fe2O3.

Therefore, 0.18mol of Fe will produce = (0.18x2) /4 = 0.09mol of Fe2O3.

Now we need to find the mass present in 0.09mol of Fe2O3. This can be achieved by doing the following:

Molar Mass of Fe2O3 = (56x2) + (16x3) = 112 + 48 = 160g/mol

Number of mole of Fe2O3 = 0.09mol

Number of mole = Mass /Molar Mass

Mass = number of mole x molar Mass

Mass of Fe2O3 = 0.09 x 160 = 14.4g

6 0

3 years ago

A sample of gas contains 0.1800 mol of CO(g) and 0.1800 mol of NO(g) and occupies a volume of 23.2 L. The following reaction tak

baherus [9]

Answer:

The volume of the sample is 17.4L

Explanation:

The reaction that occurs requires the same amount of CO and NO. As the moles added of both reactants are the same you don't have any limiting reactant. The only thing we need is the reaction where 4 moles of gases (2mol CO + 2mol NO) produce 3 moles of gases (2mol CO2 + 1mol N2). The moles produced are:

0.1800mol + 0.1800mol reactants =

0.3600mol reactant * (3mol products / 4mol reactants) = 0.2700 moles products.

Using Avogadro's law (States the moles of a gas are directly proportional to its pressure under constant temperature and pressure) we can find the volume of the products:

V1n2 = V2n1

<em>Where V is volume and n moles of 1, initial state and 2, final state of the gas</em>

Replacing:

V1 = 23.2L

n2 = 0.2700 moles

V2 = ??

n1 = 0.3600 moles

23.2L*0.2700mol = V2*0.3600moles

17.4L = V2

<h3>The volume of the sample is 17.4L</h3>

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2 years ago

When each of the following is heated to 50 degrees Celsius and the temperature is held constant for five minutes, which one unde

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3 years ago

Read 2 more answers

What is the pH of a solution of 1 x 10-5 M NaOH? Is the solution acidic or basic?

Anna007 [38]

Answer: to calculate pH use -log[H+] or - log[OH-]..the solution is basic as the “NaOH” is attached to a hydroxide.Since we need to find the pH (per hydrogen) and not the pOH( per hydroxide) we need to find the pOH of the substance first then we subtract that by 14 so we can arrive at the pH of the substance.

Explanation: So -log( 1 x 10^(-5)) = 5 which is the pOH.Now we subtract that by 14 which gives us -9 and now you’d multiply that by -1 bcuz we can’t have a negative so the pH of the substance is 9

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3 years ago