We can use the rearranged molarity equation to calculate the moles of NaCl needed for the specified concentration and volume: mol NaCl = [ NaCl] × L of solution = 0.800 mol L × 0.250 L = 0.200 mol NaCl. We can then use the molecular weight of sodium chloride, 58.44 g mol , to convert from moles to grams of NaCl : These flasks range in size from 10 mL to 2000 mL and are carefully calibrated to a single volume. On the narrow stem is a calibration mark. The precise mass of solute is dissolved in a bit of the solvent, and this is added to the flask. Then, enough solvent is added to the flask until the level reaches the calibration mark. The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14.Thus the pH of 0.015 M HNO3 is 1.82. pH is a unitless quantity. What is pH? pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.. On subtracting pH from 14, we get pOH which measures the concentration of hydroxide Calculate the pOH by plugging the [OH −] into the equation. Calculate the pH by rearranging and plugging in the pOH: pH = 14.00 - pOH. Calculate the answers. pH = − log[H3O +] = − log(0.10) = 1.00. [OH −] = 0.0044M × 2 = 0.0088 M. pOH = − log[OH −] = − log(0.0088) = 2.06. pH = 14.00 − pOH = 14.00 − 2.06 = 11.94. pH = −log[2.3 ×10−5] = 4.64 (10.5.1) (10.5.1) pH = − log [ 2.3 × 10 − 5] = 4.64. When the pH of a solution is known, the concentration of the hydrogen ion can be calculated. The inverse of the logarithm (or antilog) is the 10x 10 x key on a calculator. [H+] = 10−pH (10.5.2) (10.5.2) [ H +] = 10 − pH. Some chemists and analysts prefer to work in acid concentration units of Molarity (moles/liter). To calculate the molarity of a 70 wt. % nitric acid the number of moles of HNO 3 present in 1 liter of acid needs to be calculated. Knowing the density of the acid to be 1.413 g/mL, we can calculate the weight of 1 L of 70% HNO 3 to be 1413 .

calculate ph of hno3