Question

A solution of sodium carbonate in water has a pH value:
A.>7
B.<7
C.7
D.Equal to zero

Answer 1

pH or power of hydrogen is a scale that is used to specify the acidic or basic nature of the element or compound. It ranges from 0 to 14 where pH value less than 7 indicates acidic nature, more than 7 represents basic character (alkaline) and pH value equal to 7 is neutral.

Complete answer:
As we know the chemical formula of sodium carbonate is $N{a_2}C{O_3}$.
Sodium carbonate ( $N{a_2}C{O_3}$), also known as washing soda, which produces sodium ions ($N{a^ + }$) and carbonate ions ($CO_3^{2 - }$) and when it dissolved in water tends to form solutions with pH values between 11 and 12.
Hence, we can conclude that the pH value of a solution of sodium carbonate is more than 7 so it is basic in nature.
Therefore, option A is correct i.e., > 7 (greater than 7).

Additional Information:
pH is a scale of measuring the acidity and basicity of the solution. The pH of any solution depends on its concentration. Generally, pH of an acid solution will be lower as the solution is more concentrated and for basic, the pH will be higher with more highly concentrated solutions.
The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.
The pH and organic acid content of foods are two significant factors that may determine not only the types of organisms that will survive during storage but also their activities as spoilage organisms.

Note:
pH is the measure of relative amount of hydrogen or free hydrogen ions in the compound. This shows the range of strengths of acid and bases based on the amount of free hydrogen and it is important because our body also has a pH value which specifies the level of acid or base in our body. The pH of normal water is neutral, that is 7 .