Which of these laboratory procedures require the use of standard solution(s)?TitrationEstimationFiltrationDilution What is a standard solution?A solution of known concentration of one or multiple compoundsA solution of known PHA solution of 1 mol/L of one or multiple compoundsA solution of 1 mol/L of a single compound

Disclaimer: Since you have asked multiple question, we will solve the first question for you. If you want any specific question to be solved then please specify the question number or post only that question. Standard solutions are used in laboratories to determine the concentration of unknown solutions. Standard solutions have a known concentration of element or substance present in the solution. The known mass of the solute is dissolved in the solvent to make the specific volume of the standard solution. The standard solutions are of two types, primary and secondary. Primary standard solutions have a higher concentration and less reactivity. a) Titration is the process of determining the quantity of an unknown solvent in a solution using another solution with a known concentration. The solution with the known concentration is a standard solution and hence titration uses standard solutions in the laboratory. This option is correct. b) Estimation in the laboratory is making some guesses for a measurement. The process of estimation doesn't require the standard solution. This option is incorrect. c) Filtration is the process of removing unwanted solid particles from the fluids. This process doesn't require a standard solution. Hence, the option is incorrect. d) Dilution is the process of reducing the concentration of the solution either by reducing the amount of solute or by increasing the amount of solvent. This process doesn't require a standard solution. Hence, the option is incorrect.Option A, titration is correct.