When a mixture of two black powders is heated, it gave off a gas which turned lime water milky
Give a chemical equation to show the reaction between gas and lime water
Red scales residue can be seen on the black residue. Name the red scales
The red scale residue partly dissolves in dilute acid to form a pale blue solution. Name the pale blue solution and give chemical equation to support your answer.
What are the names of the two powders?
powders are carbon and cupric oxide
red sclae - copper
pale blue solution - CuSO4
rest do by yourself
Post answers please!!!
To find the answers to your questions, let's break them down one by one:
1. Chemical equation for the reaction between gas and lime water:
To determine the chemical equation, we need to know the gas produced. However, given the information provided, we don't have the specific gas. Generally, when carbon dioxide (CO2) gas reacts with lime water (calcium hydroxide, Ca(OH)2), it forms a white precipitate of calcium carbonate (CaCO3) which turns the lime water milky. The chemical equation for this reaction is:
CO2 + Ca(OH)2 -> CaCO3 + H2O
2. Name of the red scales residue:
The red scales residue is not specifically mentioned in the given information. Without more details, it's difficult to pinpoint the exact substance. However, red scales often refer to iron(III) oxide (Fe2O3), commonly known as rust.
3. Name of the pale blue solution formed when the red scale residue dissolves in dilute acid:
The pale blue solution formed when the red scale residue dissolves in dilute acid could be copper sulfate solution (CuSO4). This is because copper(II) oxide, which may be present in the red scale residue, reacts with dilute acid (such as hydrochloric acid) to form copper sulfate. The chemical equation for this reaction is:
CuO + HCl -> CuSO4 + H2O
4. Names of the two black powders:
The information provided does not specify the names of the two black powders. Without additional details, it is not possible to determine their exact identities.