Making Salts Flashcards
What acid is used for this experiment?
Sulphuric Acid
What base is used?
Copper oxide
What is the purpose of the practical investigation in this document?
To investigate the effect of temperature on the rate of reaction between sodium thiosulfate and hydrochloric acid.
This investigation typically involves measuring the time taken for a reaction to complete at different temperatures.
What are the two main chemicals used in the reaction studied?
Sodium thiosulfate and hydrochloric acid.
These chemicals react to form a precipitate that obscures vision.
What observable change indicates that the reaction has occurred?
The solution turns yellow and cloudy.
This cloudiness is due to the formation of sulfur, a product of the reaction.
What is the independent variable in this experiment?
Temperature of the sodium thiosulfate solution.
The experiment tests how changing the temperature affects the rate of reaction.
What is the dependent variable in this experiment?
Time taken for the solution to turn cloudy.
This measures the rate of reaction indirectly.
List the safety precautions that should be taken during the experiment.
- Wear safety goggles
- Use gloves
- Handle acids with care
These precautions help prevent injuries from chemical splashes and reactions.
Fill in the blank: The reaction between sodium thiosulfate and hydrochloric acid produces _______.
Sulfur.
Sulfur is a solid that forms during the reaction, causing the solution to become cloudy.
True or False: The rate of reaction increases with temperature.
True.
Higher temperatures typically increase the kinetic energy of particles, leading to more frequent collisions.
What equipment is needed for this practical investigation?
- Beakers
- Measuring cylinders
- Stopwatch
- Thermometer
Proper equipment ensures accurate measurements and observations.
What method is used to measure the rate of reaction in this experiment?
By timing how long it takes for a marked cross to disappear.
The cross is placed under the beaker, and the time is recorded until it is no longer visible.
What is the role of hydrochloric acid in the reaction?
It reacts with sodium thiosulfate to produce sulfur.
Hydrochloric acid provides the necessary hydrogen ions for the reaction.
Fill in the blank: The rate of reaction can be affected by _______.
Temperature, concentration, surface area, catalysts.
These factors influence how quickly reactants collide and react.
What is the expected outcome of the experiment when temperature is increased?
The time taken for the solution to turn cloudy decreases.
This indicates a faster reaction rate at higher temperatures.
What is the significance of repeating the experiment at each temperature?
To ensure reliability and accuracy of results.
Repeating helps to identify anomalies and verify consistency.
What is a salt in chemistry?
A salt is an ionic compound formed from the neutralization reaction of an acid and a base.
True or False: All salts are soluble in water.
False
What is the general method for making a salt?
The general method involves reacting an acid with a base, metal, or carbonate.
Fill in the blank: The reaction between hydrochloric acid and sodium hydroxide produces _____ salt.
sodium chloride
Which apparatus is commonly used to evaporate water from a salt solution?
Evaporating dish
What is the role of a pH indicator in salt preparation?
To determine when the reaction has reached neutral pH.
What type of reaction occurs when an acid reacts with a metal carbonate?
A neutralization reaction that produces salt, water, and carbon dioxide.
