What forms when a solution containing dissolved baking soda and lemon juice are mixed indicates that a chemical change has taken place?

Answer 1

When baking soda and lemon juice are added together, a chemical reaction occurs. The reaction of the two is an acid-based reaction because it involves an acid (citric acid in the lemon juice) reacting with a base (sodium bicarbonate, more commonly known as baking soda). We can write this reaction as follows:

C6H8O7 + 3NaHCO3 <---> Na3C6H5O7 + 3H2CO3

In other words, a molecule of citric acid reacts with three molecules of sodium bicarbonate to form a molecule of sodium citrate and three molecules of carbonic acid. Although an acid is reacting with a base, this is not a neutralisation reaction. In a neutralisation reaction, the products are water and salt; lemon juice is a weaker acid and baking soda is an organic salt. If you were to measure the pH of a solution containing the products, it would be lower than 7 (acidic).

Answer 2

Your question is describing an acid-base reaction. In this example the baking soda (base) has a pH (presence level of hydrogen) greater than 7, and the lemon juice (acid) has a pH level less than 7. This is based on a pH scale that ranges from 0 (extremely acidic) to 14 (extremely basic), with 7 as the midpoint (a neutral compound). In general, when a compound has a pH level greater than 7, it is called a basic solution because it has less hydrogens than what would normally be found in a neutral compound, such as water. When a compound has a pH level less than 7, it is called acidic because it has more hydrogens than what would normally be found in a neutral compound. When an acid and a base come in contact with one another, the resulting chemical change is known as dissociation, or the transfer of hydrogen atoms. Dissociation is the process of attempting to make two or more combined compounds (baking soda and lemon juice) as close to neutral as possible. An acidic compound will freely give up extra hydrogens in order to become neutral, and a basic compound will freely accept extra hydrogens in order to become neutral.

Answer 3

it is a chemical change as it says in my nelson grade 9 text book, though i'm unsure as t why :)

Answer 4

When baking soda is mixed with lemon juice, the gas evolved is CO2. It's A chemical change since the two substances react to form a new one, and the change is irreversible too.

Answer 5

Yes, this is a chemical change.