A very common question I get is âhow much is concrete per yardâ? It is a somewhat difficult question to answer because suppliers are frequently changing their prices, and there are many different pricing factors. However, in general the cost per yard as of today (March 29, 2011) is as follows: 2500 psi (I never use this) = $95-110 (Charlotte NC Metroâ Concrete Contractor Average) 3000 psi (most common) = $100-115 (Charlotte NC Metroâ Concrete Contractor Average)
Electrolytes are compounds which produce ions when in water. Soluble ionic compounds do this by breaking up into the constituent ions in water. But if the ionic compound is not soluble, such as lead chloride, then the compound does not break up into ions, and is thus not an electrolyte.
Substances that give ions when dissolved in water are called electrolytes. They can be divided into acids, bases, and salts, because they all give ions when dissolved in water. These solutions conduct electricity due to the mobility of the positive and negative ions, which are called cations and anions respectively. Strong electrolytes completely ionize when dissolved, and no neutral molecules are formed in solution. For example, NaCl, HNO3, HClO3, CaCl2 etc are strong electrolytes. An ionization can be represented by, NaCl(s) = Na+(aq) + Cl-(aq) Since NaCl is an ionic solid (s), which consists of cations Na+ and anions Cl-. No molecules of NaCl are present in NaCl solid or NaCl solution.