Show how silicates of divalent ions are insoluble in water whereas silicates of monovalent ions are soluble. Aligned to the Next Generation Science Standards (NGSS)* Disciplinary Core Ideas: PS1.A; PS1.B Performance Expectations: MS-PS1-2 Cross Cutting Concepts: Patterns Engineering Practices: Analyzing and Interpreting Data Kit Includes: 50mL Calcium Chloride, 1.0M Solution 50mL Calcium Chloride, 1.0M Solution with Phenolphthalein 200mL Sodium Silicate, 15% Aqueous Solution DOT Info: Non-regulated *”Next Generation Science Standards” is a registered trademark of Achieve. Neither Achieve nor the lead states and partners that developed the Next Generation Science Standards was involved in the production of, and does not endorse, this product. WARNING: This product can expose you to chemicals including Phenolphthalein, which is known to the State of California to cause cancer. For more information go to http://www.P65Warnings.ca.gov.