![]() How many moles of X -? Moles of X - = number of moles of alkali used up.Ĭoncentration of X - = moles of alkali used / volume in dm 3įind by rearrangement and put in the numbers: Some theory and an explanation of the calculations with formulas can be found below the calculators. If, entered concentrations are not matched to a buffer solution. pKa value will be filled automatically, when you select the acid / base combination. Fill concentrations of each acid and base. Select the acid / base combination of buffer solution. The first one calculates the pH of a strong acid or strong base solution, and the second one calculates the pH of a weak acid or weak base solution. Please follow following steps to determine pH of buffer solution. Then use a calculator to plug the 0.2 M into the pH formula. In general there are 6 steps to calculate the pH of an aqueous solution of the salt of a strong acid and a weak base at 25☌. (don’t worry about V unless you have to because it will probably cancel out) Below you can find two calculators that you can use to check answers to chemistry problems. The pH formula tells us that the pH is the negative log of the hydrogen ion concentration which is 0.2 molar. Calculate pH of solution: pH log 10 H 3 O +(aq) pH log 10 3.2 × 10 -6 5.5. What is final concentration of the acid (HX)?Ĭoncentration of acid = moles of acid / volume in dm 3 Determine the H 3 O + H 3 O + 10 -pH 10 -7.20 6.31 x 10 -8 Step 2. Moles of acid left over = 0.008 – 0.002 = 0.006 The pH and pOH Calculator is useful when working with chemicals. Moles of acid left over = moles of acid at the start – moles of alkali added For the 'classic' view of the pool calculator see Classic Pool Calculator. ![]() For background on what the various numbers mean, see Basic Pool Chemistry. Get the equation right: HX + NaOH ? NaX + H2OK The Pool Calculator takes care of all the math that might come up while you are keeping your swimming pools water chemistry in balance, telling you exactly how much of each chemical to add. Calculate the pH of a buffer solution formed by adding 20.00 cm 3 of 0.10 moldm -3 NaOH to 40.00 cm 3 of the weak acid, HX, which has a concentration of 0.20 moldm -3 and a Ka value of 5 x 10 -6.
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