2425 S2 2nd UT

Acids have a _______________ taste. Alkalis give a _______________ feel and some of them have a _______________ taste.

Contain acids: ________________________

Groups:

(a) Acid

,

(b) Alkali

,

(c) Neutral

• Baking Soda

• Toothpaste

• Vinegar

• Noodles

• Orange

• Soft Drink

• Bleach

• Rice Dumpling

• Distilled Water

• Kitchen Cleaner

• Lotion

_______________ _______________, _______________ _______________ (lime water) and _______________ solution are common alkalis found in the laboratory.

Most acids and alkalis in the laboratory are _______________ or even corrosive.

Most acids and alkalis in the laboratory are irritant or even _________.

Colours of blue and red litmus paper in different substances: Match the following:

In acidic substances Blue Litmus paper- (a)  

In alkaline substance​ Blue Litmus paper ​ ​ (b)  

In acidic substances Red Litmus paper- (c)  

In alkaline solution, red litmus paper - (d)  

• turns red
• remains blue
• remains red
• turns blue

Colours of blue and red litmus paper in different substances: Match the following:

In neutral substance​ Blue Litmus paper ​ ​ (a)  

In neutral substances Red Litmus paper- (b)  

• remains blue
• remains red
• turns red
• turn blue

The __________ indicator consists of a range of pH values. It is used to describe the relative acidity or alkalinity of a substance. In general, pH value ranges from _ to __.

A (20) __________ __________ is an electronic instrument used to measure the pH values of solutions.

During neutralization, _____ and ____ are formed, and _______ energy is released.