A milkman adds a very small amount of baking soda to fresh milk. Why does he shifts the pH of the fresh milk from 6 to slightly alkaline?

The milkman adds a small amount of baking soda to shift the pH of the fresh milk from 6 to slightly alkaline. In alkaline conditions, milk does not set as curd easily and this helps in preventing the milk from getting converted to curd.

Calculate the pOH of 0.007 M aqueous solution of NaOH. (log7 = 0.8451)

Formula to calculate pH: pH + pOH = 14 pOH = - log [ OH - ] = - log [ 0 . 007 ] = - log [ 7 × 10 - 3 ] = 3 log 10 - log 7 ( log 10 = 1 ) = [ ( 3 × 1 ) - 0 . 8451 ] = 3 - 0 . 8452 = 2 . 1549 pOH = 2 . 1549

Explain importance of pH in soil.

Soil pH affects the number of nutrients and chemicals that are soluble in soil water, and therefore the number of nutrients available to plants. Some nutrients are more available under acid conditions while others are more available under alkaline conditions. pH is so important to plant growth because it determines the availability of almost all essential plant nutrients. At a soil pH of 6.5, the highest number of nutrients are available for plant use.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>Gujarat Board-2020>Q 7

EASY

10th Gujarat Board

IMPORTANT

Earn 100

A milkman adds a very small amount of baking soda to fresh milk.

Why does this milk take a long time to set as curd?

Important Questions on Acids, Bases and Salts

HARD

10th Gujarat Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>Gujarat Board-2019>Q 8

What is the chemical formula of sodium zincate?

MEDIUM

10th Gujarat Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>Gujarat Board-2020>Q 9

Name the chemical compound commonly used by your mother in the kitchen for making tasty crisp pakoras or cake. State its chemical formula and write the chemical equation of its production.

EASY

10th Gujarat Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>Gujarat Board-2018>Q 10

Vankarbhaibhas explained the definition of an acid and a base, given by Robert Boyle in the classroom. Then the students of the classroom gave some suggestions regarding acid and base. Which suggestion is wrong among these?

Prashant: Acids are sour in taste and bases are bitter.

Dhruvi: Acid does not give any effect on wet blue litmus paper while base turns blue litmus paper blue.

Seil: Acid liberates dry hydrogen gas $(H_{2})$ by the reaction with the metal. The base does not react with all metals.

Jaydeep: By neutralisation reaction between acid and base, salt and water is produced.

MEDIUM

10th Gujarat Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR SCIENCE>Chapter 2 - Acids, Bases and Salts>Gujarat Board-2018>Q 11

What is neutralisation process? Explain with a chemical equation.

MEDIUM

10th Gujarat Board

IMPORTANT