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ch4aika [34]
3 years ago
10

indicators are chemicals that change colour in presence of an acid or an alkali. Universal indicators and pH meters are used to

measure pH. Desccribe how you would use a universal indicator to find the pH of sodium hydroxide. What colour change would you observe
Chemistry
1 answer:
Troyanec [42]3 years ago
7 0

Answer:

Purple. Sodium Hydroxide is an Alkali/base. Bases and Alkalis

have a pH greater than 7, and turn blue-purple in universal

indicator.

Explanation:

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Hope this helps! :)

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An acid is used to bring the pH of a solution from pH 9 to pH 6. How many times more acidic is the final solution than the initi
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The final solution is 1.5 times more acidic than the initial solution

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3 years ago
Select the equations below that represent physical changes.
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Physical changes- any change in the physical properties of the substance is a physical change. Generally physical properties include color, state, size , shape, odour, appearance . In any phyical change, no new substance is formed.

Chemical changes- any change in the chemical properties of the substance is a chemical change. Chemical properties changes only when something new is formed during a reaction.

∴ <u>Part A</u>- 2 H2O(l) → 2 H2(g) + O2(g)

In this, H2 and O2 is produced during the reaction which is different from H20. Thus, it is a chemical change.

<u>Part B</u>- H2O(l) → H2O(s)

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<u>Part C</u><u>-</u>CO2(s) → CO2(g)

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The bond formed is a polar covalent bond.

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