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3 years ago

Please Help! I just started balancing equations and my teacher gave me this. Thanks in advance! :D

Chemistry

2 answers:

Alenkasestr [34]3 years ago

8 0

So you need to put numbers before each compound to make sure there are the exact same number of elements on each side. If you put a 4 before NH4 there are 4 Nitrogen and now 16 hydrogen. I just played around with numbers and guessed until I got them even.

matrenka [14]3 years ago

5 0

Answer:

3. AlCl3 + 3 AgNO3 => Al( NO3) 3 + 3 AgCl

4. ( NH4)2 Cr2O7 => N2 + Cr2O3 + 4 H2O

5. Al2S3 + 6 NaHCO3 => 2 Al(OH)3 + 3 Na2SO2 + 6 CO

Explanation: Solution attached on the balanced equation.

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Explanation:

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The ionization of pure water forms _____.

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Answer: The ionization of pure water forms hydroxide and hydronium ions.

Explanation:

Ionization is a reaction in the pure water in which water breaks down into its constituting ions that hydronium ion and hydroxide ions.

$H_2O+H_2O\rightleftharpoons H_3O^++OH^-$

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3 years ago

A 0.69-g sample of lime (CaO) is dissolved in enough water to make 1535 mL of solution. Calculate the pH of of the solution.

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Answer:

pH = 12.2

Explanation:

Given data:

Mass of lime = 0.69 g

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pH of solution = ?

Solution:

First of all we will determine the molarity.

Molarity = moles of solute / volume in litter

Number of moles = mass / molar mass

Number of moles = 0.69 g / 56.1 g/mol

Number of moles = 0.0123 mol

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Molarity = 0.0123 mol / 1.535 L

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pOH = 1.8

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