. 56. Sodium thiosulfate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.55 Sodium Thiosulfate Pentahydrate (Sodium sulfurothioate hydrate (2:1.5)) (CAS No.10102–17–7) (provided for in subheading 2832.30.10) Free No change No change On or before 12/31/2020 . 57. Barium nitrate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.56 Barium dinitrate (CAS No. 10022–31–8) (provided for in subheading 2834.29.51) Free No change No change On or before 12/31/2020 . 58. Sodium hypophosphite Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.57 Sodium hypophosphite monohydrate (CAS No. 10039–56–2) (provided for in subheading 2835.10.00) Free No change No change On or before 12/31/2020 . 59. Monopotassium phosphate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.58 Monopotassium phosphate (CAS No. 7778–77–0) (provided for in subheading 2835.24.00) 1.0% No change No change On or before 12/31/2020 . 60. Ammonium polyphosphate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.59 Ammonium polyphosphate (CAS No. 68333–79–9) (provided for in subheading 2835.39.50) Free No change No change On or before 12/31/2020 . 61. Cobalt carbonate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.60 Cobalt carbonate (cobalt(2+) carbonate hydrate (1:1:1)) (CAS No. 513–79–1) (provided for in subheading 2836.99.10) Free No change No change On or before 12/31/2020 . 62. Zirconium basic carbonate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.01.61 Zirconium basic carbonate (zirconium(4+) dicarbonate) (CAS No. 57219–64–4) (provided for in subheading 2836.99.50) Free No change No change On or before 12/31/2020 . 63. Potassium ferricyanide