Question

1)What is the chemical nature of 'lime water' ?
2)Name the acid present in grapes
3)Name a food item that is a source of oxalic acid
4)List the three naturally occurring indicators ​

Answer 1

Explanation:

1.Limewater is the common name for a dilute aqueous solution of calcium hydroxide. Calcium hydroxide, Ca(OH)2, is sparsely soluble at room temperature in water (1.5 g/L at 25 °C).

2.The principal organic acids found in grapes are tartaric, malic, and to a small extent, citric.

3.Foods High in Oxalate

Foods High in OxalateBeet greens.

Foods High in OxalateBeet greens.Rhubarb.

Foods High in OxalateBeet greens.Rhubarb.Spinach.

Foods High in OxalateBeet greens.Rhubarb.Spinach.Beets.

Foods High in OxalateBeet greens.Rhubarb.Spinach.Beets.Swiss chard.

Foods High in OxalateBeet greens.Rhubarb.Spinach.Beets.Swiss chard.Endive.

Foods High in OxalateBeet greens.Rhubarb.Spinach.Beets.Swiss chard.Endive.Cocoa powder.

Foods High in OxalateBeet greens.Rhubarb.Spinach.Beets.Swiss chard.Endive.Cocoa powder.Kale.

4.Turmeric, china rosa, red cabbage and grape juice.

Answer 2

1) Limewater is the common name for a dilute aqueous solution of calcium hydroxide. Calcium hydroxide, Ca(OH)2, is sparsely soluble at room temperature in water (1.5 g/L at 25 °C). "Pure" (i.e. less than or fully saturated) limewater is clear and colorless, with a slight earthy smell and an astringent/bitter taste

2) The principal organic acids found in grapes are tartaric, malic, and to a small extent, citric. Many other organic acids, including amino acids, are also found in juice and wines, but tartaric and malic acid account for over 90% of the total acids present.

3) Beet greens.

Rhubarb.

Spinach.

Beets.

Swiss chard.

Endive.

Cocoa powder.

Kale.

4) Natural Indicators and Universal Indicators

The indicators that are obtained from plants are known as natural indicators. Examples – Turmeric, china rosa, red cabbage and grape juice. Some flowers such as the hydrangeas can also determine whether a substance is acidic or basic.