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- Chemistry; Chem Sci/Eng
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- Hard water is water contaminated with compounds of calcium and magnesium. Dissolved iron, manganese, and strontium compounds can also contribute to the "total hardness" of the water, which is usually expressed as ppm CaCO3. Water with a hardness over 80 ppm CaCO3 is often treated with water softeners, since hard water produces scale in hot water pipes and boilers and lowers the effectiveness of detergents. antoine.frostburg.edu
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- Some laundry detergents do not produce as many suds in hard water, these are likely to be soap-based products and do not work as well in hard-water as detergent based products. - water-treatment.org.uk
![](https://cfcdn.proz.com/images/wikiwords/small_grey_arr.gif) - Hard water also contributes to inefficient and costly operation of water-using appliances. Heated hard water forms a scale of calcium and magnesium minerals that can contribute to the inefficient operation or failure of water-using appliances. - Wilkes University
![](https://cfcdn.proz.com/images/wikiwords/small_grey_arr.gif) - Clothes washed in hard water often look dingy and feel harsh and scratchy. - sciLinks
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- Твърда вода е вода с високо съдържание на минерали, обикновено калциеви и магнезиеви (Mg2+) йони, и в някои случаи други разтворени елементи като бикарбонати и сулфати. Противоположното понятие е мека вода - вода с ниско минерално съдържание.
Калцият във водата обикновено се намира или като калциев карбонат (CaCO3) или като калциев сулфат (CaSO4). Wikipedia - by bibienne (X)
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- Твърда вода е вода с високо съдържание на минерали, обикновено калциеви и магнезиеви (Mg2+) йони, и в някои случаи други разтворени елементи като бикарбонати и сулфати.
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by bibienne (X) - Ефективността на перилните препарати при употреба в твърда вода се понижава многократно, в резултат на получаването на неразтворими калциеви и магнезиеви соли на висшите мастни киселини. - Internetreklama
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- Chemistry; Chem Sci/Eng
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- Tvrda voda je uzrokovana prisustvom otopljenih soli kalcija i magnezija (nekada i željeza). Prolazna (privremena) tvrdoća potiče od kalcija i hidrogenkarbonata i uklanja se kuhanjem.Stalna tvrdoća se odnosi na sulfate i kloride kalcija i magnezija. Wikipedia - by vladowsky
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- Vode s mineralnih i termalnih izvora obiluju kalcijem i magnezijem i uvijek imaju visoki stupanj tvrdoće. Kada govorimo o konzumnoj vodi, problem se ne zove TVRDA VODA nego KAMENAC koji se javlja kao posljedica transporta kroz vodovodne instalacije i promjene pritiska i temperature tijekom njezina iskorištavanja. Omekšana voda potrebna je u mnogim proizvodnim procesima ali nije pogodna za ljudsko zdravlje. - Agromarketing
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- En química, el agua dura (por contraposición al agua blanda) es aquella que posee una dureza superior a 120 mg CaCO3/l. Es decir que contiene un alto nivel de minerales, en particular sales de magnesio y calcio. Son éstas las causantes de la dureza del agua, y el grado de dureza es directamente proporcional a la concentración de sales metálicas. Wikipedia - by Laura Mangini
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- El agua dura puede volver a ser blanda, con el agregado de carbonato de sodio o potasio, para precipitarlo como sales de carbonatos, o por medio de intercambio iónico con salmuera en presencia de zeolita o resinas sintéticas - Wikipedia
by Laura Mangini - Related KudoZ question
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