Chemistry Past Questions and Answers

Smoke consist of?

Na<sub style='font-size: smaller;'>2</sub>C<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>4</sub> + CaCl<sub style='font-size: smaller;'>2</sub> → CaC<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>4</sub> + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?

2.0g of a monobasic acid was made up to 250 cm<sup style='font-size: smaller;'>3</sup> with distilled water. 25.00 cm<sup style='font-size: smaller;'>3</sup> of this solution required 20.00cm<sup style='font-size: smaller;'>3</sup> of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is?

What is the concentration of H<sup style='font-size: smaller;'>+</sup> ions in moles per dm<sup style='font-size: smaller;'>3</sup> of a sodium of pH 4.398?

What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm<sup style='font-size: smaller;'>3</sup> of 0.05 M acid?