1. Measure 10 cm3 of sodium thiosulfate solution into the conical flask. 2. Dilute the solution by adding 40 cm3​ ____into the conical flask. 3. Put the ____on the black cross. 4. Measure 10 cm3​ ​of____ hydrochloric acid. 5. Add the ____to the flask. Then quickly at the same time, ____the flask gently and start the stopwatch. 6. Look down through the top of the flask. Stop the clock when you can no longer see the cross and record the ____ taken. 7. Repeat steps 1‒6 , using different ____ of sodium thiosulfate and water - ____ cm sodium thiosulphate solution + 30 cm3​ w​ater. 8. ____ steps and calculate the____time for each of the sodium thiosulfate concentrations.

Disappearing cross method

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