What are some questions to ask about acids and bases?
Acids and bases: Frequently asked questions
- Why are acids called proton donors?
- Why can’t hydrogen ions exist by themselves?
- How is [H+] found from pH?
- Is a negative pH possible?
- How can you tell if a compound is an acid?
- What is pH?
What happens when any acids react with any alkali?
A neutralisation reaction is always:Acid + Alkali —> Salt + WaterHowever, because the question is asking for ions, there is no salt. Acids are H+ ions (this gives them acidic properties) and alkalis are OH- ions (this gives them alkaline properties), and together they react to form water.
What is the indicator used to identify acids and alkalis?
Indicators are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory….Litmus.
| Red Litmus | Blue Litmus | |
|---|---|---|
| Alkaline solution | Turns blue | Stays blue |
What happens when acids mix with alkalis?
When you add an alkali to an acid a chemical reaction occurs and a new substance is made. If exactly the right amounts of acid and alkali are mixed, you will end up with a neutral solution. This is called a neutralisation reaction.
Can alkalis neutralise acids?
As we add an alkali to acid, the particles in the acid and alkali react. The resulting solution becomes less acidic (the pH increases) as we add more alkali. This reaction between acids and alkalis is called neutralisation.
How are alkalis made?
The manufacture of industrial alkali usually refers to the production of soda ash (Na2CO3; sodium carbonate) and caustic soda (NaOH; sodium hydroxide). Other industrial alkalies include potassium hydroxide, potash, and lye. The production of a vast range of consumer goods depends on the use of alkali at some stage.
Why do we have to be careful with some acids and alkalis?
Acids and bases are corrosive substances that can attack various surfaces including human tissue. The amount of tissue damage they cause depends on the strength and concentration of the acid or base and the duration of exposure. The acidity or alkalinity of a substance can be determined by its pH value.
What Colour does litmus change to in an acid?
red
Blue litmus paper turns red under acidic conditions (pH below 4.5) while red litmus paper turns blue under alkaline conditions (pH above 8.3).
How do alkalis neutralise acids?
When an acid reacts with an alkali it produces a salt and water. This reaction is called neutralisation. The alkali has neutralised the acid by removing its H+ ions, and turning them into water.
What are the hazards of alkalis?
Section 4 – Potential Hazards Alkali metals are extremely reactive with water producing flammable hydrogen gas that can ignite spontaneously. It also produces caustic hydroxide solution (i.e., Sodium hydroxide) upon contact with water. It may be harmful if inhaled, ingested, or absorbed through the skin.