Some science statements are false statements? which one's are and are not?

Question

1. An important difference btw. detergents and soaps is that soaps can be used in hard water.
2. Salts are made from bases, and esters come from alcohols that are also bases but have a hydroxyl group.
3. Polyesters are synthetic fibers that are made from an organic base that has two -COOH gruops and an acid that has two -OH groups.
4. Titration is a process in which a solution of an unknown concentration is used to determine the concentration of another solution.
5. The endpoint of titration occurs when a drop of base turns the acid solution pink but the color changes back again.

Answer 1

1. false... soaps will precipitate in the presence of hard water (for example, the stains in the shower door)
2. this one is not well asked... I would say True
3. True... It can also be made from a molecule with a COOH and a OH in opposite sides of the molecule
4. False. One of the solutions should have a known concentration
5. False. The color has to remain at least 1 minute

Answer 2

1. Detergents work much better in hard water than soaps do.
2. Implication is wrong. All bases ordinarily have a hydroxyl group.
3. Don't know.
4. False. Everything is correct except the word "unknown".
5. False. The color change has to stick. And, note that there are a number of indicators used, with different colors and different pH end points.

Answer 3

1. false, it is detergents that work in hard water
2. false, salts are made from acids and bases. Alcohols may have an OH but they are not bases
3. true , sort of.esters are made from acids (COOH) and alcohols(OH), organic bases are NH2 The statement has errors.
4. true
5. false, it can not turn back again

Answer 4

1.- False.
2.- True.
3.- True.
4.- False
5.- False