you need
• - paper;
• - handle;
• - Calculator.
Guide
1
To find titer and on solute (simple titer ), use the formula: T = m / V, where T - titer ;m - mass of a substance dissolved in a liquid, V - the volume of solution in cubic centimeters or milliliters.
2
addition, titer you can calculate on the analyte.This value is also called a conditional titer th.This will require the formula: T (a / b) = mb / Va, where T (a / b) - titer a solution of the substance for substance b;mb - material mass b (in grams) is reacted with the solution;Va - volume of a solution of the substance (in milliliters).
3
For example, to find titer phosphoric acid solution weighing 18 g, prepared by dissolution in H3PO4 282 milli
liters of water.The density of the solution is 1.031 g / ml.First, find the mass of the prepared solution, taking into account that 282 ml of water are equal to 282 g: 28 + 282 = 300 (d).Then, calculate its volume: 300 / 1,031 = 291 (ml).Now substitute in the formula and find titer : 18/291 = 0,0619 (g / ml).
4
addition to the methods described above, you can also calculate the titer , knowing the equivalent weight and normal (equivalent concentration) .T = CH * Mekv / 1000, where T - titer , Tn - normality, Mekv - the equivalent weight.
5
Often you will encounter problems in which the need to express titer one substance over another.For example, given the condition: at titer sc 20 ml of a solution of hydrochloric acid titer ohm 0.0035 g / mL has been spent with 25 ml sodium hydroxide solution.It is necessary to calculate the titer NaOH by HCl.
6
Please write reaction equation: NaOH + HCl = NaCl + H2O.Then calculate titer alkali solution according to the formula: T (NaOH) = T (HCl) * V (HCl) * M (NaOH) / M (HCl) * V (NaOH).Substituting numerical values, get titer of sodium hydroxide equal to 0.0031 g / ml.It remains to calculate the required value for the solution of the problem: T (NaOH / HCl) = T (NaOH) * Meq (HCl) / Meq (NaOH) = 0,0028 g / ml