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To calculate the difference in pH strength of a solution, subtract the initial pH value from the final pH value. For example, if the initial pH is 5 and the final pH is 3, the difference in pH strength would be 2.
The final pH would be less than 5 because the stronger acid (pH 4.0) would have a greater effect on the overall pH than the weaker acid (pH 6.0). To calculate the exact final pH, you would need to know the exact concentrations of the two solutions and perform a Henderson-Hasselbalch calculation.
7
The final pH of the mixture will depend on how much of the strong acid you add. The initial amount of acid will neutralize the alkaline solution, and if there is enough of the strong acid, the final pH will then become acidic, i.e. pH < 7.
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When mixing a solution at pH 4 with a solution at pH 8, the final pH will be between 4 and 8. The resulting pH will depend on the ratios of the two solutions being mixed. If equal volumes are mixed, then the final pH will likely be around 6.
When a strong acid and strong base neutralize each other in a reaction, the final pH is 7, which is considered neutral.
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The initial color of the shampoo will be the color of the China rose solution, which is usually red or pink. The final color will depend on the pH of the shampoo, with pink indicating an acidic pH and green indicating a neutral pH.
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To prepare 0.5 M phosphate buffer pH 7.0, dissolve the appropriate amounts of monobasic potassium phosphate and dibasic potassium phosphate in water. Adjust the pH using either dilute HCl or NaOH, while continuously checking with a pH meter until pH 7.0 is reached. Dilute to the desired final volume with water if needed and ensure that the final pH is within the acceptable range.
pH refers to the relative concentration of H+ ions in solution.