The difference is gradual, but not sharply drawn:
Diluted means (more) lower concentration, in laboratory practice less than 1.0 M (<1.0 mol/L) and concentratedacids (or other solutions) are higher concentrated, above 1.0 mol/L .
If you're talking about the lab bottles, "dilute" means "6M" (which is not really all that dilute) and "concentrated" means "straight out of the stock bottle", i.e very nearly pure acid in most cases (of the common laboratory acids you'll see in a college general chemistry lab, HCl is the only one that isn't "pure", because pure HCl is a gas; HCl out of a stock bottle is generally about 12M).
Addition of water to a concentrated acid gives a dilute acid as the product. However adding water should be done very carefully as those reactions involved are highly exothermic and may cause even explosions.
yes it is it more harmful than dilute acid
A diluted acid is a concentrated acid that has been diluted by water so it is not as concentrated. Sometimes the final dilution is expressed as a percentage of the original acid. More often we use molarity. In common lab use the dilute acids are 2M.
acids and alkalis have no difference
An acid is considered 'weak' or 'strong' regardless of concentration or dilution. An acid's strength is determined by how easily the H+ ions disassociate in an aqueous solution. Strong acids like HCl do this readily, and are considered strong, even when heavily diluted. Organic acids like Citric Acid tend to be 'weak' acids, and are considered 'weak' even when concentrated.
Concentrated acids are more dangerous in generally, but some dilute acids can still be dangerous as well.
No.
Concentrated acids are more dangerous.
Diluted acids don't have such a high PH scale so they aren't as corrosive and don't burn. Concentrated acids such a Hydrochloric acid with a PH scale of 1 are highly corrosive and will burn a lot, maybe so much that it'll eat through your skin.
yes it is it more harmful than dilute acid
because if you get the acid on you ,your skin will burn so you have to dilute it so its safer
A diluted acid is a concentrated acid that has been diluted by water so it is not as concentrated. Sometimes the final dilution is expressed as a percentage of the original acid. More often we use molarity. In common lab use the dilute acids are 2M.
Drinking squash, concentrated vegetable boullion (stock), some fruit juices are concentrated then diluted again... basically anything that has been boiled to remove the water content is "concentrated".
acids and alkalis have no difference
An acid is considered 'weak' or 'strong' regardless of concentration or dilution. An acid's strength is determined by how easily the H+ ions disassociate in an aqueous solution. Strong acids like HCl do this readily, and are considered strong, even when heavily diluted. Organic acids like Citric Acid tend to be 'weak' acids, and are considered 'weak' even when concentrated.
Get Diluted
Nitric acid refers to the chemical in any form. 'Concentrated' specifically defines it in a concentrated solution.
Concentrated acids are more dangerous in generally, but some dilute acids can still be dangerous as well.