Wie nennt man Stoffe mit denen man alkalische Lösungen erkennen kann?
Solche Farbstoffe nennt man Indikator en (lat.: indicare = anzeigen). Am verbreitetsten sind in der Chemie die Säure-Base-Indikatoren, die nicht nur zur Anzeige des pH-Werts, sondern auch zur Bestimmung des sogenannten Äquivalenzpunkts von Säure-Base-Titrationen genutzt werden.
Was passiert wenn Säure und alkalische Lösungen aufeinandertreffen?
Saure und alkalische Lösungen können miteinander reagieren. Diese Reaktion ist eine Neutralisationsreaktion zwischen den Oxonium-Ionen bzw. H +-Ionen der sauren Lösung und den Hydroxid-Ionen bzw. der alkalischen Lösung.
What are the characteristics of alkali?
Alkaline solutions are slippery or soapy to the touch, due to the saponification of the fatty substances on the surface of the skin. Alkalis are normally water-soluble, although some like barium carbonate are only soluble when reacting with an acidic aqueous solution. Difference between alkali and base
What are some examples of alkali salts?
Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are: Sodium hydroxide – often called „caustic soda“. Potassium hydroxide – commonly called „caustic potash“. Lye – generic term for either of the previous two or even for a mixture.
What is alkaline aqueous solution?
Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH −) when dissolved in water. Common properties of alkaline aqueous solutions include: Moderately concentrated solutions (over 10 −3 M) have a pH of 7.1 or greater. This means that they will turn phenolphthalein from colorless to pink.
What are the two subsets of alkali metals?
One of two subsets is commonly chosen. A basic salt of an alkali metal or alkaline earth metal (This includes Mg (OH) 2 but excludes NH 3 .) Any base that is soluble in water and forms hydroxide ions or the solution of a base in water. (This includes Mg (OH) 2 and NH 3 .)