6-the following type of solution is used to help identify or determine the concentration of an unknown substance. a-Primary standard b-Standard solution c-Ionic solution d-Variable solution 7-The substance available for the standardization of a solution that is highly pure a. Primary standard b. Secondary standard c. Quaternary standard d. Tertiary standard 8-. is a solution whose concentration has been accurately determined a. Primary standard b. Quaternary standard c. Tertiary standard d. Standard solution 9-The standard solution can prepared by a- weighed method. b- dilution method. ca and b d- none 10- Is involving mixing of a concentration solution with additional solvent to give a larger final volume. a- the dilution b- the neutralization c-Ionic solution d-Variable solution